Barack Obama has served his campaign very well by never once, to my recollection, playing the dreaded race card. I would be shocked if he started now, but I've now seen two people connected to his campaign say that it might have been a factor.
One was a Georgetown professor and Obama supporter on this evening's Hardball, and here's another from Obama's campaign co-chair Jesse Jackson, Jr.
Even though they're not saying it was the reason, it is still a big mistake. The media and pollsters will analyze race as a factor in how wrong the polls are of their own accord. The last thing Obama should want is for his campaign to be associated with pushing the theme.