The big debate on Morning Joe was that the "1 in 7" were the same group of voters who supported Hillary, liberal white men. Joe also said these were the same people that twice voted for Reagan, Clinton, and Bush. Basically, he thinks they aren't really undecided, they are just lying about their intention to vote for McCain.
I call bullshit. Liberal white men would be MORE likely to vote for Obama, not less, if for no other reason than to assuage their white guilt.