It's like republicans don't remember 2008. Am I crazy for remembering the amount of heat Obama faced over Wright in the primaries, and how for a few moments it truly was going to sink his campaign? Of course, Obama addressed the issue openly with a pretty monumental speech that discussed race in an adult fashion rarely seen; needless to say, conservatives did not participate in that conversation, and instead continued to embarrass themselves with stupid opinions ("Obama threw his grandmother under the bus!").
Of course, Wright later wound up personally injecting himself into the campaign by making more ignorant comments, which forced Obama to completely disown and condemn him.
Then there's the Ayers story, which McCain's camp ran with, PACs made ads about, and was discussed in interviews and debates. Same with the Rezko story, and every other fringe attack McCain's camp hurled at Obama. Guess what? He still won
Basically when republicans pull the vetting card, they're really just pulling the "what do we REALLY know about Obama" card regardless of the evidence. Never mind the guy ran for president for a year and a half, wrote a memoir, has been in the public spotlight since 2006, etc etc etc. He's clearly hiding something and the media won't tell us what it is!