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Jana Behm Math 320 July 7, 2010. Math and politics A look at how math affects elections. Voting Systems and how they can effect outcomes *Majority Rule *Plurality Voting *Electoral College. overview. *Straight forward *Excellent for choosing between 2 candidates *Most votes wins
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July 7, 2010
>Votes cast: 100 with 2 candidates– winner needs a simple majority which is (100/2) +1 or 51 votes to win the election.
*Plurality voting: simple math
>Votes cast: 100 with 3 candidates – winner simply needs the most votes, not necessarily a majority of the votes cast.The math of Majority and plurality voting
Total Votes Clinton Bush Perot
104,425,014 44,909,326 39,103,882 19,741,657
43.01% 37.45% 18.91%
Therefore Clinton was the winner, but did not receive the majority of the votes cast
Source: http://iun.edu/~mathiho/mathpol/fall00/chapter11.htmThe math of Majority and plurality voting
*How are the representatives divided?
*Is this fair?
*2009 estimates US population to be 307,006,550 peopleU.s. electoral college
MT 974989 0.32% 3 0.56%
IA 3007856 0.98% 7 1.30%
IL 12910409 4.21% 21 3.90%
FL 18537659 6.04% 27 5.02%
NY 19541453 6.37% 31 5.76%
TX 24782302 8.07% 34 6.32%
CA 36961664 12.04% 55 10.22%
US Population = 307,006,550 Electoral votes possible: 538
Source for population numbers: http://quickfacts.census.gov/qfd/states/17000.htmlU.S. electoral college continued
Candidate Popular Vote % Electoral Vote %
George W. Bush 50,460,110 47.87% 271 50.4%
Albert Gore Jr. 51,003,926 48.38% 266 49.4%
Neither candidate had a simple majority as there were 6 candidates on the ballot.
Plurality voting is not in effect in the United States
President Bush won 2 large electoral states, but MANY of the smaller states that added up for the electoral win
Mr. Gore won largely populated states, but not enough of them for electoral victory.
Source: http://www.uselectionatlas.org/RESULTS/national.php?f=0&year=2000Winning an election but losing the popular vote
http://www.realclearpolitics.com/epolls/maps/obama_vs_mccain/?map=1Let’s play with the math