Bush /Kerry Obama /McCain 2008 House 2008 Senate 2010 House(From July until election day they had Republicans taking the House over 50) Wisconsin recall( Had Walker over 50 the life of the contract)
It is probably poll based. Even the Reps don't want a Mormon president... By the way fivethirtyeight gives similar chances based on the Electoral College. Obama's lead is 311 to 226: http://fivethirtyeight.blogs.nytimes.com/