Romney to attack

Mitt Romney will spend the next few weeks attacking the Democratic presidential frontrunners. Romney's aides are telling Marc Ambinder they're "worried that Republicans generally aren't doing enough to soften up the Democrats," though they're probably more worried that Republicans generally aren't believing Romney is one of them. So, he goes on the attack so he will be attacked in return, thus proving his credentials.

Rick Perlstein summed up this tactic pretty well in The New Republic a few months ago.