Top McCain Adviser Won't Attack Obama

A top adviser to John McCain says he will quit if Obama gets the Dem nomination:

"I would simply be uncomfortable being in a campaign that would be inevitably attacking Barack Obama," said McCain adviser Mark McKinnon in an interview with NPR's "All Things Considered." "I think it would be uncomfortable for me, and I think it would be bad for the McCain campaign."

"I met Barack Obama, I read his book, I like him a great deal," said McKinnon. "I disagree with him on very fundamental issues. But I think, as I said, I think it would a great race for the country."

Democrats: Obama's nomination, even the prospect of it, is changing the political landscape. How can you reject that?