where "character" = being black

McCain takes aim at Obama’s character
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The article literally says that the McCain campaign is now going to push bigotry since they have no other ammunition - they are going to go after Barack for being black and having a mixed background.

Utterly revolting...but completely expected from the repugs. They can't attack Obama's views because the majority of Americans agree with him and disagree with McCain, so they have to go with lies and bigotry.