As Dean Barnett writes below, the Obama campaign has officially pledged to "take off the gloves" and fight those dastardly Republicans with "ferocity". Rawr! Jake Tapper notes, however, that this tack has been taken before by (losing) Democratic candidates:

Like any number of Democratic candidates before him -- Mike Dukakis, Al Gore, John Kerry -- Sen. Barack Obama, D-Illinois, is once again declaring that he is going to take off the gloves and fight back against attacks from the Republican party....

But just so you know -- this is by my count the 4th time Obama's campaign has officially or unofficially made such a declaration that Obama will "take off the gloves" and fight back.

That's a lot of pairs of gloves.

The Isotoner campaign, one might say.

Heh. Here's Obama's new 'hard-hitting' ad: