- A surprise "No" from Landrieu or Lincoln: Sen. Joe Lieberman (I-CT) is threatening to filibuster the bill at a later date, but he's indicated that he'll vote "yes" tomorrow. Landrieu and Lincoln, on the other hand, are biding their time.
- An unexpected absence: Sen. Max Baucus (D-MT) has been in Montana for a couple days, attending to his mother, who is reportedly very ill. Separately, Sen. Robert Byrd (D-WV) has been in bad health for quite a while, and, though he's been there when he's been needed, he has also missed a number of votes this year. If either, or both men can't make it to the Capitol tomorrow, it will likely cause a (potentially very long) delay.
Those are the updates we'll be bringing you tomorrow, along, of course, with the breakdown of the vote itself. If the clerk calls the role, the outcome won't be in doubt--but we may not know until quite late.