Welcome to the murky world of modern racism, where most of the open animus has been replaced by a shadowy bias that is difficult to measure. As Obama gently put it in his race speech, today’s racial “resentments aren’t always expressed in polite company.” However, they can be  and possibly will be  expressed in the privacy of the voting booth.

If the percentage of white voters who cannot bring themselves to vote for a black candidate were only 15 percent, that would be more than all black voters combined. (Coincidentally, it also would be more than all voters under 24 years old.) That amounts to a racial advantage for John McCain.

And this sentiment stretched across ideological lines. Just as many white independents as Republicans said that most of the people they knew would not vote for a black candidate, and white Democrats were not far behind. Also, remember that during the Democratic primaries, up to 20 percent of white voters in some states said that the race of the candidate was important to them. Few of those people voted for the black guy.

Some might say that turnabout is fair play, citing the fact that 89 percent of blacks say they plan to vote for Obama. That level of support represents a racial advantage for him, too, right? Not necessarily. Blacks overwhelmingly vote Democratic in the general election anyway. According to CNN exit polls John Kerry got 88 percent of the black vote in 2004.