Barack Obama's campaign manager David Plouffe analyzes the electability of his candidate, and in response to a question on whether race will be a factor in determining Obama's electability, posits that most racists are already going to vote for John McCain anyway: http://www.nationaljournal.com/njonline/no_20080425_7012.php.
Q: Well, one of the things to which some Democrats point -- the Clinton campaign has not said this publicly at least, but one certainly hears it in talking to supporters in more of a background way. Look at the racial polarization in the last several contests -- Pennsylvania, Ohio, Mississippi -- is that going to be a problem? Is race going to be a problem for Barack Obama in the general election?
Plouffe: We really don't think so. I mean the vast, vast majority of voters who would not vote for Barack Obama in November based on race are probably firmly in John McCain's camp already.
That about says it all, doesn't it?