Electad: http://electad.com/ An independent site which claims that it posts all examples from the different campaigns online. The site also indexes polls, tweets and interviews.
Many newspapers also analyse the latest ads. See this example from the Washington Post. http://www.washingtonpost.com/wp-srv/special/politics/track-presidential-campaign-ads-2012/
If you are interested in ads, the Living room candidate enables you to view examples from all past campaigns from 1952-2008. http://www.livingroomcandidate.org/ The site is maintained by the Museum of the Moving Image. It includes online clips and transcripts, as well as lesson plans for teachers which analyse what makes an effective ad.
The Political Communication Lab at Stanford University also has a store of ads from the current campaign. There are also past examples from 1994 onwards: http://pcl.stanford.edu/campaigns/2012/ plus some examples of online working papers on electoral campaigning and politics in the US: http://pcl.stanford.edu/research/papers/
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