Real Clear Politics Poll of Polls: Obama with a 1/2 point lead (47.9/47.4)
Includes, Pew, Rasmussen, Gallup, Politico, CNN, Nat Journal and NBC / Wallstreet Journal.
http://www.realclearpolitics.com/epolls/2012/president/us/general_election_romney_vs_obama-1171.html