39. Spoiler Effect. Wikipedia. (en.wikipedia.org/wiki/
40. Partisan Polarization Surges in Bush, Obama Years. Pew Research Center. 4 June 2012. (www.people-press.org/2012/06/
41. Presidential Ads 70 Percent Negative in 2012, Up from 9 Percent in 2008. Wesleyan Media Project. 2 May 2012. (mediaproject.wesleyan.edu/
42. Dean Reynolds. Almost All Presidential Ads on the Air Are Negative. Kantar Media. 18 July 2012. (kantarmediana.com/cmag/press/
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