Barney Frank does want Kerry's Senate seat.

"A month ago, or a few weeks ago, I said I wasn’t interested... It was kind of like you’re about to graduate, and they said: 'You gotta go to summer school.' But [the fiscal cliff deal] now means that February, March and April are going to be among the most important months in American financial history.... “I’ve told the governor I would now like, frankly, to do that...."