"I've seen some calls from DU and DC for the Dems to boycott the vote tomorrow--are they allowed to do that? Can the Senators just not show up for the vote, once cloture passes in an hour or so?"
Oh, please do. I would think they would only need a quorum and then the 51 votes. Not sure of the rules.
Good thing is there would be no way that the media could hide that.
LOL. Not and be within the rules of the Senate. They are obliged to VOTE. They have to give a reason, and "be excused" for being unable to.