[OneWingedShark]

Right. But IIRC, it takes 2/3 of the members present.
I can see Dingy Harry pulling some shenanigan at 3am where there are just enough for a quorm, mostly Dems, of course, and then calling for the vote.
That would be no more of a dirty trick than the way he got nobamacare passed.

It says "members present", nothing about a quorum -- strictly speaking zero senators would fit the bill, or if you were to argue that at least some senators must be present then one of one is 100%.

[Sherman Logan]

The Senate cannot be in valid session unless a quorum is present. Of course, I believe a member must demand a quorum call to put this provision into effect.