So How Come...?

So why is it that Barack Obama can closely affiliate himself with a preacher who endorses a chronic bigot who makes statements that clearly meet the criteria for unequivocal racism, such as "White people are potential humans - they haven't evolved yet," and then, when Obama issues a lame, off-point CYA response, the political left is willing to give him a pass?

Ron Paul never made such a statement, and if you look at the notorious past newsletters that are at the center of the maelstrom, they didn't go anywhere near that far, either.