In the Caucas blog at the New York Times, Matt Bai argues that Bill Clinton may have given the Obama campaign some bad advice. He convinced them to stop painting Romney as a "flip-flopper" and instead label him an "extreme conservative." This label isn't sticking, Bai argues, because Romney isn't an extreme conservative. 

The bottom line here is that one can over-think this whole notion of framing your opponent. Ninety-nine times out of 100, the line of attack that works best is the one that really rings true. In the case of Mr. Romney, whatever his stated positions may be, the idea that he’s a far-right ideologue, a kind of Rush Limbaugh with better suits and frosty hair, just doesn’t feel especially persuasive.

I'm not sure that Bai gets it right. Obama, at least during the debates, has been trying to frame Romney as a boardroom stiff, who is out of touch with regular Americans. Maybe they need to do a better job pushing that message, because I think that the Rich Stiff frame is very powerful.