No more Mr. Nice Newt.

As he girds for what is expected to be a disappointing showing in tonight’s Iowa caucuses, Republican presidential candidate Newt Gingrich is lashing out, calling rival Mitt Romney a “liar” responsible for negative ads that sunk the former House speaker’s campaign.

“This is a man whose staff created the PAC, his millionaire friends fund the PAC, he pretends he has nothing to do with the PAC. It’s baloney,” Gingrich said on CBS’ “The Early Show” (see video below). “He’s not telling the American people the truth.”. . .