There are two big Congressional health care stories:
The Ego Story: Will the Finance Committee hammer out a deal? What about the public option? Or a "trigger"? But Pelosi doesn't like the trigger! Can the competing plans ever be merged? Should the subsidy be increased? And how to pay for it: unions don't like taxing "Cadillac" health plans! The House vote is close too!
The Id Story: They're still scared to vote on the bill. It's not popular enough among people who vote. They don't want to die (politically).
As is so often the case, the ego story is in large part a cover for the id story. When Congress doesn't want to vote on a bill, there are lots of difficult issues to be negotiated. That turns out to take a lot of time. Sometimes, darn, those difficult issues just can't be resolved and the bill fails, even though everyone supports it in one form or another!
When the id says vote, the issues get resolved in a day or two. ... 1:02 P.M.