You know your campaign has blown it when your opponent runs a campaign ad featuring your supporters blasting one of your major lines of attack:

Brutal.

Mitt Romney is doing this, one can surmise, for multiple reasons. First, it makes President Obama look foolish, and may give big Obama donors even more doubts about supporting him. Second, if Romney can disable a central argument against him — he’s for some form of capitalism that doesn’t employ anyone and steals from the poor — he is freed to use his “I understand business and you don’t” line with impunity. Finally, it’s an invitation to Democrats like Cory Booker and Harold Ford, Jr., urban and suburban voters who aren’t inherently anti-business. In other words, “It’s okay to dump Obama — even his supporters know his rhetoric is garbage.”