President Obama needed to step up and dig in at Tuesday night's second presidential debate, and that’s exactly what he did, I write over at CNN. Insistent jockeying for time, his fumble of the Benghazi question, and furious Etch-a-Sketch moments on everything from Pell Grants to the Dream Act may have hurt Romney with swing voters – exactly the ones he needs to hone in on in the coming weeks.

And he just came across as a bully:

“Mitt Romney followed a great debate with a fail. His constant interruption of Candy Crowley and the president – his peevish, ‘Hall Monitor Mitt’ persona – was not just a loss in terms of style points. It was revealing in terms of character. The CNN focus group found that the intense awkward interjections alienated swing voters and women in particular. Tweets to me used words like ‘entitled’ and ‘bully.’ Bottom line, it wasn’t presidential. It was small and self-important rather than big and magnanimous. And it will cost him momentum.

“The president started the debate hot rather than warm; he seemed almost too amped up. Romney did a better job relating to the audience as individuals at first. And then the insistent jockeying for time came, and the wheels started to come off his initially steady performance.”

It was a win for Obama, and Romney might not just have lost, he might have done himself substantive damage.

Read more at CNN.