Sen. Barack Obama right now is chatting privately with Sen. Carl Levin of Michigan as senators cast votes on the senate floor.

Obama, who got a warm welcome the last time he tended to his Capitol Hill day job, has been shaking hands and patting arms on the floor since the vote began. Sen. Hillary Clinton also is there voting, and right now is talking to supporter Sen. Dianne Feinstein of California.

Levin, an undecided superdelegate who had long wanted his state to have more influence in the primary process, might talking to Obama about the senator's campaign trip there tomorrow. Or they might be talking about how to resolve the mess with Michigan's delegates.

Obama also chatted amiably with Sen. Bob Casey of Pennsylvania (who supports him) and Sen. Debbie Stabenow of Michigan (who supports Clinton). He greeted Sen. Barbara Mikulski of Maryland (Clinton supporter) and greeted Sen. Pat Leahy (Obama supporter).

He might be aiming to win over more superdelegates - already his tally for the day is four new supporters. His aides say he is 147 delegates from winning the Democratic nomination.

UPDATE, 12:04 p.m.: Obama just wandered over to chat with Sen. Robert Byrd, whose state West Virginia is voting today and likely will overwhelmingly favor Clinton. The Byrd talk was a bit of a senate no-no, since the senate president pro tem was sitting behind Majority Leader Harry Reid, who was talking to the C-SPAN camera at the time.

— Christina Bellantoni, national political reporter, The Washington Times