This site on voting discusses some of the voting dilemmas encountered in this section:

http://mathworld.wolfram.com/Voting.html

This site by the American Mathematical Society gives an excellent overview of voting and elections.

http://www.ams.org/featurecolumn/archive/voting-introduction.html

This site gives some references to Arrow’s Impossibility Theorem:

http://mathworld.wolfram.com/ArrowsParadox.html

You can use this site to find real-life examples of voting dilemmas:

http://www.archives.gov/

This site has an agenda aimed at proportional representation. Arrow’s impossibility theorem proves that there is no perfect voting method, but this site does make interesting reading.

http://accuratedemocracy.com/elect.htm#Page2