One of the links you’ll find to the right is to FiveThirtyEight.com, probably the best polling site in the world for the 2008 elections. New York Magazine has a lengthy profile of Nate Silver, FiveThirtyEight’s founder, and his background in statistics – it’s a very interesting read regardless of your political views.
Be warned, though, that Silver is predicting a high chance of Obama victory in November, and leans left himself, although his site is pretty even-handed. Those that would find this at odds with their Ideology should consider themselves warned.