The Electoral
College
Excursions in Mathematics
,
Chapter 2
Thinking Mathematically,
Chapter 14
Play video found at:
Article II of the United States Constitution
Section 1. The executive Power shall be vested in a President of the United States of America. He
shall hold his Office during the Term of four Years, and, together with the Vice President, chosen for the same Term, be elected, as follows:
Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of
Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress: but no Senator or
Amendment 12 - Choosing the President, Vice-President.
The Electors shall meet in their respective states, and vote by ballot for President and Vice-President, …they shall make distinct lists of all persons voted …which lists they shall sign …and transmit sealed to …the President of the Senate; The President of the Senate shall, in the presence of the Senate and House of Representatives, open all the certificates and the votes shall then be counted; The person having the greatest Number of votes …shall be the President, if such number be a majority of the
whole number of Electors appointed; and if no
person have such majority, then from the persons having the highest numbers not exceeding three … the House of Representatives shall choose
immediately, by ballot, the President. …the votes shall be taken by states, the representation from each state having one vote; a quorum for this
Amendment 23 - Presidential Vote for District of Columbia.
1. The District constituting the seat of Government of the United States shall appoint in such manner as the Congress may direct: A number of electors of President and Vice President equal to the whole
number of Senators and Representatives in
Congress to which the District would be entitled if it were a State, but in no event more than the least populous State; they shall be in addition to those appointed by the States, but they shall be
considered, for the purposes of the election of President and Vice President, to be electors
appointed by a State; and they shall meet in the
District and perform such duties as provided by the twelfth article of amendment.
538 electors for each election
since 1964
Why are there 538 electors?
435 House
100 Senate
3 D.C.
538 TOTAL
+
The number is set by law, to be divided among states according to the ten-year
U.S. census. According to the
constitution, there are 2 senators for each of the 50
states.
A constitutional amendment gives D.C. a number of electors equal to 2 senators
+ a number of
representatives at least equal to those of the
smallest state.
RECALL
Electors per state =
Representatives +
Senators
OR
Congressional Districts +
Senators
OR
g Increase 1
elector
g Increase 2+
electors
g Decrease 1
elector
g Decrease 2
electors
g No change
US Electoral College
Changes for 2012
How do the electors
vote?
Most states are “winner takes all.”
In 48 states and D.C., the plurality winner of the
popular vote in each state gets all the electoral votes for that state.
In Maine and Nebraska, one electoral vote
corresponds to the popular vote in each
congressional district and the remaining two electoral votes go to the overall state popular vote winner.
Most electors pledge their vote in advance.
Electors are usually chosen by political parties as a
reward for service to that party. They pledge to vote for the party’s official candidate.
In 26 states and D.C., state laws require electors to
g Law for
pledge
g ~Law for pledge
g No Law
States with Laws
Has an elector ever voted
differently than pledged?
In 57 elections for president, some electors voted
differently than pledged in 19 (33%) elections!
From 1 to 63 electors voted differently than
pledged in elections, for a total of 158 electors.
The reasons include:
2 by accident
2 for same party 3 for another party 3 for non-candidate 4 in protest
6 for VP as president 63 since candidate
died
75 only changed VP
7 for another party 8 since candidate
died
23 in protest 37 for
non-candidate These faithless
electors have never changed an
election’s final outcome!
Discounting changing a pledged vote when the candidate died, there have
only been
87 faithless voters in 17 elections.
This amounts to 30% of the 57 elections but only 0.4% of the approximately 23,027
How often do popular vote results
and electoral vote results differ?
There have been 57 presidential elections.
In 53 of these (about 93%), the winner of
the electoral college vote is also the
winner of the national popular vote.
How often do popular vote results
and electoral vote results differ?
These are the exceptions:
1824, John Q. Adams vs. Andrew Jackson
Here’s the story…
Jackson had a plurality of popular votes and electoral votes, but not majority. The House of
Representatives, whose Speaker was now-eliminated candidate Henry Clay, voted for Adams. After being elected, Adams appointed Clay Secretary of State.
The decision went to the House in 1800 also. Then the 1st place
candidate was president and 2nd place
was VP. Thomas Jefferson and Aaron Burr ran for president and VP; they got equal votes. Soon after, the 12th
How often do popular vote results
and electoral vote results differ?
These are the exceptions:
1824, John Q. Adams vs. Andrew Jackson
1876, Rutherford B. Hayes vs. Samuel J.
Tilden
Here’s the story…
How often do popular vote results
and electoral vote results differ?
These are the exceptions:
1824, John Q. Adams vs. Andrew Jackson
1876, Rutherford B. Hayes vs. Samuel J.
Tilden
1888, Benjamin Harrison vs. Grover
Cleveland
Here’s the story…
How often do popular vote results
and electoral vote results differ?
These are the exceptions:
1824, John Q. Adams vs. Andrew Jackson
1876, Rutherford B. Hayes vs. Samuel J.
Tilden
1888, Benjamin Harrison vs. Grover
Cleveland
2000, George W. Bush vs. Al Gore
Here’s the story…
After the election, media reported Bush had 246
electoral votes, Gore had 255, and 270 were needed to win. Three states were too close to call: New
Mexico (5), Oregon (7), and Florida (25). Gore had a plurality of the popular vote (48.4%) over Bush
Could we have used
a different system?
Congress could choose the president.
Might upset the balance of power
State legislatures could select the president.
Might make president prefer one state to another
People could elect the president by popular vote.
Might vote only for “favorite son” with no information about the other candidates
Might only have presidents from large, populous states
A “Committee of Eleven” proposed an indirect election of the president through a College of
Should we still use the
Electoral College system?
PROS
It allows small states to
have a say in the election.
It creates political stability
by encouraging a 2-party system.
With the winner-takes-all
allocation of votes, the victory seems conclusive.
It avoids the possibility of a
national recount; recounts in close elections would be confined to a few states.
CONS
Some votes are “worth” more
than others; votes in small states are disproportionate to those in larger states.
It discourages 3rd parties.
A person can win without
having a majority of the popular vote.
There is a risk of selecting
faithless electors.
Voter turnout may be lower
How are Representatives, and
therefore Electors, apportioned?
Hamilton’s Method
Jefferson’s Method
Adams’s Method
Webster’s Method
Hamilton’s Method
Alexander Hamilton
• Founding father of United
States
• 1st Secretary of State under Washington
Hamilton’s Method
• Congress passed method in
1791
• Pres. Washington vetoed (1st ever veto)
• Adopted in 1852 and used until
standard divisor = total population
number of allocated items =
1890
30 =63
The Republic of Collier
Has 4 states with 30 total representatives.
State A B C D TOTA
L
Population 275 383 465 767
Hamilton’s Method
State A B C D TOTA
L
Population 275 383 465 767 1890
standard divisor = total population
number of allocated items standard divisor = total population
number of allocated items =
1890 30
standard quota = group population standard divisor
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen t
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen
t 4
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen
t 4 6
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen
t 4 6 7
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen
t 4 6 7 12
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen
t 4 6 7 12 29
Which state gets the
extra representati
The Republic of Collier
Has 4 states with 30 total representatives.
Hamilton’s Method
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen
t 4 6 7 12 29
HAMILTON’S METHOD
1. Calculate each group’s standard quota.
2. Round down to the nearest whole number (lower quota).
3. Give any extra items, one at a time, to the group with the largest decimal part before the rounding.
Hamilton’s Method
There were many problems with Hamilton’s Method.
The Alabama Paradox: An increase in the total
number of representatives being apportioned forces a state to lose one of its representatives.
The Population Paradox: A positive population
growth rate in one state forces it to lose one or more of its representatives to a state with a small or even zero population growth rate.
The New-States Paradox: The addition of a
new state with its fair share of seats can affect the apportionment of other states.
How are Representatives, and
therefore Electors, apportioned?
Hamilton’s Method
Jefferson’s Method
Adams’s Method
Webster’s Method
Jefferson’s Method
Thomas Jefferson
• Wrote the Declaration of
Independence
• 3rd President of the United States
Jefferson’s Method
• 1st apportionment used by U.S. Congress
• Used from 1791 until 1842 • Gave no “preferential
The Republic of Collier
Has 4 states with 30 total representatives.
Jefferson’s Method
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 1st Try
Apportionmen
t 4 6 7 12 29
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. Then when the quota is calculated and rounded down, the total number of representatives is correct.
= 1890
30 =63
Need this number bigger, so try smaller
divisor!
The Republic of Collier
Has 4 states with 30 total representatives.
Jefferson’s Method
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 30
Final Apportionmen
t
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. Then when the quota is calculated and rounded down, the total number of representatives is correct.
= 1890
30 =6360
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.58 6.38 7.75 12.78 30 Final
Apportionmen t
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.58 6.38 7.75 12.78 30 2nd Try
Apportionmen
t 4 6 7 12 29
The Republic of Collier
Has 4 states with 30 total representatives.
Jefferson’s Method
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 30
Final Apportionmen
t
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. Then when the quota is calculated and rounded down, the total number of representatives is correct.
= 1890
30 =6360 55
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 5.00 6.96 8.45 13.95 30 Final
Apportionmen t
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 5.00 6.96 8.45 13.95 30 3rd Try
Apportionmen
t 5 6 8 13 32
The Republic of Collier
Has 4 states with 30 total representatives.
Jefferson’s Method
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 30
Final Apportionmen
t
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. Then when the quota is calculated and rounded down, the total number of representatives is correct.
= 1890
30 =6360 55 59
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.66 6.49 7.88 13.00 30 Final
Apportionmen t
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.66 6.49 7.88 13.00 30 Final
Apportionmen
t 4 6 7 13 30
SUCCES S! Notice that State D increased, rather than
The Republic of Collier
Has 4 states with 30 total representatives.
Jefferson’s Method
JEFFERSON’S METHOD
1. Calculate each group’s standard quota.
2. Round down to the nearest whole number (lower quota).
3. If the total does not match the number of
representatives, adjust to a modified divisor (by trial-and-error) and repeat.
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.66 6.49 7.88 13.00 30 Final
Apportionmen
t 4 6 7 13 30
Standard divisor =
63
Modified divisor =
Jefferson’s Method
There were problems with Jefferson’s Method as
well:
There is no formula to find the modified divisor.
It violates the
Quota Rule
which states that a
group’s apportionment should either be the
lower quota (the standard quota rounded
down) or the upper quota (the standard quota
rounded up).
In trying to be fair, Jefferson’s Method
How are Representatives, and
therefore Electors, apportioned?
Hamilton’s Method
Jefferson’s Method
Adams’s Method
Webster’s Method
Adams’s Method
John Quincy Adams
• 6th President of the United States
• Served in House of
Representatives 18 yrs
Adams’s Method
• Was a “mirror image” of
Jefferson’s Method, using modified upper quotas
• Was never actually used by
The Republic of Collier
Has 4 states with 30 total representatives.
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen t
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. Then when the quota is calculated and rounded up,
the total number of representatives is correct.
= 1890
30 =63 Try 65
Adams’s Method
Round UP!
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen
t 5 7 8 13
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 1st Try
Apportionmen
t 5 7 8 13 33
Need this number smaller, so
The Republic of Collier
Has 4 states with 30 total representatives.
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 30
Final Apportionmen
t
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. Then when the quota is calculated and rounded up,
the total number of representatives is correct.
= 1890
30 =63
Adams’s Method
Round UP!
65
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.23 5.89 7.15 11.80 30 Final
Apportionmen t
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.23 5.89 7.15 11.80 30 Final
Apportionmen
t 5 6 8 12
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.23 5.89 7.15 11.80 30 2nd Try
Apportionmen
t 5 6 8 12 31
The Republic of Collier
Has 4 states with 30 total representatives.
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 30
Final Apportionmen
t
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. Then when the quota is calculated and rounded up,
the total number of representatives is correct.
= 1890
30 =63
Adams’s Method
Round UP!
65 67
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.10 5.72 6.94 11.45 30 Final
Apportionmen t
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.10 5.72 6.94 11.45 30 Final
Apportionmen
t 5 6 7 12
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.10 5.72 6.94 11.45 30 Final
Apportionmen
t 5 6 7 12 30
The Republic of Collier
Has 4 states with 30 total representatives.
ADAMS’S METHOD
1. Calculate each group’s standard quota.
2. Round up to the nearest whole number (upper quota).
3. If the total does not match the number of
representatives, adjust to a modified divisor (by trial-and-error) and repeat.
Standard divisor =
63
Modified divisor =
67
Adams’s Method
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.10 5.72 6.94 11.45 30 Final
Apportionmen
Of course, there were problems with Adams’s
Method:
There is no formula to find the modified divisor.
It also violates the
Quota Rule
which states
that a group’s apportionment should either be
the lower quota (the standard quota rounded
down) or the upper quota (the standard quota
rounded up).
In trying solve the problem of upper quota
violations caused by Jefferson’s Method,
Adams’s Method created a lower-quota
violation.
How are Representatives, and
therefore Electors, apportioned?
Hamilton’s Method
Jefferson’s Method
Adams’s Method
Webster’s Method
Webster’s Method
Daniel Webster
• Served in House of
Representatives 8 yrs, the Senate 19 yrs, Secretary of State 4 yrs
Webster’s Method
• Used modified quotas but
conventional rounding
• Used 1842 – 1852 and again
The Republic of Collier
Has 4 states with 30 total representatives.
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen t
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. When the quota is
calculated and rounded as usual, the total number of representatives is correct.
= 1890
30 =63 Try 65
Webster’s Method
Regular Rounding: up for 5 or larger, else down.
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 Final
Apportionmen
t 4 6 7 12
State A B C D TOTA
L
Population 275 383 465 767 1890 Standard
Quota 4.37 6.08 7.38 12.17 30 1st Try
Apportionmen
t 4 6 7 12 29
The Republic of Collier
Has 4 states with 30 total representatives.
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 30
Final Apportionmen
t
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. When the quota is
calculated and rounded as usual, the total number of representatives is correct.
= 1890
30 =63
Webster’s Method
Regular Rounding: up for 5 or larger, else down.
65
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.23 5.89 7.15 11.8 30 Final
Apportionmen t
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.23 5.89 7.15 11.8 30 Final
Apportionmen
t 4 6 7 12
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.23 5.89 7.15 11.8 30 2nd Try
Apportionmen
t 4 6 7 12 29
Still not right…
The Republic of Collier
Has 4 states with 30 total representatives.
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 30
Final Apportionmen
t
standard divisor = total population
number of allocated items
standard quota = group population standard divisor
Find a modified divisor. When the quota is
calculated and rounded as usual, the total number of representatives is correct.
= 1890
30 =63
Webster’s Method
Regular Rounding: up for 5 or larger, else down.
65 62
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.44 6.18 7.50 12.37 30 Final
Apportionmen t
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.44 6.18 7.50 12.37 30 Final
Apportionmen
t 4 6 8 12
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.44 6.18 7.50 12.37 30 Final
Apportionmen
t 4 6 8 12 30
Lots of guessing
The Republic of Collier
Has 4 states with 30 total representatives.
WEBSTER’S METHOD
1. Calculate each group’s standard quota.
2. Round normally to the nearest whole number. 3. If the total does not match the number of
representatives, adjust to a modified divisor (by trial-and-error) and repeat.
Standard divisor =
63
Modified divisor =
62
Webster’s Method
State A B C D TOTA
L
Population 275 383 465 767 1890 Modified
Quota 4.44 6.18 7.50 12.37 30 Final
Apportionmen
Webster’s Method is a little better choice, but:
There is no formula to find the modified divisor.
It does not favor large or small states.
It may violate the
Quota Rule
but violations
are rare. (Note: If Webster’s Method had been
used for all apportionments from 1790 until
2000, no violation of the quota rule would have
occurred.)
Many believe that Webster’s Method is the
best overall apportionment method and
that we might return to it …but it is not
what the U.S. is currently using.
So what does the U.S.
currently use for apportionment?
• Speaker of House requests mathematical
formula
• Joseph Hill, Chief Statistician of the Bureau
of the Census
• Edward Huntington, Professor of Mechanics
and Mathematics at Harvard University
• Aka Method of Equal Proportions
• FDR signed 1941 Apportionment Act which
made it the permanent, self-executing method for 435 House seats
• Rounding is done by comparing the
fractional part of the quota to the geometric mean of the upper and lower quotas and
adjusting to a modified quota if needed
• But it can also violate the quota rule