It's always amazed me how many people try to claim they voted for Obama because they thought Sarah Palin was too dumb to be president. Really? Joe Biden is a functional retard, and Obama can't be very bright himself if he thought Biden would be anything other than a tremendous embarrassment.
Meanwhile, Palin was the only person on either ticket in 2008 who had any executive experience at all, and she proved she could hold her own against Biden in a debate. I relish the thought of Biden having to face off against Paul Ryan... we can surely expect Ryan to run circles around Biden, unless Obama dumps Biden to put someone else on the ticket. But I really doubt that Obama is smart enough to do that or humble enough to admit it was a mistake to ever pick Biden in the first place.