The Big Conversation:

In a break with his top staffer, Herman Cain isn't backing down from allegations that the Rick Perry campaign is behind the controversy engulfing the presidential race.

On Thursday, Cain campaign manager Mark Block backed off charges that the Perry camp had leaked to Politico the story about sexual harassment charges Cain faced in the 1990s. "Let’s get over these things that don’t mean anything to the American public," Block said on Fox News.

But an angry Cain, in an appearance later on Sean Hannity's radio show, renewed his attack on the Perry ...

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