Washington Post 4/21/08:

during a forum shown on MSNBC, host Chris Matthews asked McCain if he would "sit down with the Democratic nominee . . . and agree to them that there will be no outside sleazeball attacks by either side, that you will tell your people you will condemn any attack, like a swift-boating, and you will both agree to do that upfront, right after you get the nomination?"

"I would love to do that," McCain replied. "During the primary, there was a 527 that sprang up. And I asked them to stop."

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