Chris Cillizza asks whether the departure of Jim Johnson signals a weak Obama campaign. Perhaps, but not for the reason Chris says.

The RNC's immediate reaction to Johnson's stepping away was a press release asking when Obama would ask Eric Holder to step down. Where does the war of attritition end? And why did the Obama campaign, if they were standing on principle, decide to back down in the face of criticism? If Obama's choice of Johnson was a mistake in the first place, then that's one thing. But if the campaign doesn't believe they made an error -- and they don't -- why give the Republicans a trophy head?

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