Okay, we've now heard back from the office of a second GOP Senator who looks close to breaking ranks with the leadership by voting tomorrow in favor of the House anti-escalation resolution going to the Senate floor: Senator Olympia Snowe of Maine.

Jake Ward, a spokesperson for Senator Snowe, tells Election Central that the Senator is likely to vote for cloture on the House resolution coming before the Senate tomorrow.

That brings the total thus far to two GOP Senators who are expected to support cloture. As we reported earlier today, Snowe's fellow Maine Senator Susan Collins, also a Republican, is also expected to vote for the measure to go to the floor.

GOP leaders are urging a No vote tomorrow, arguing that they should be allowed to introduce a competing resolution about war funding -- a move that Dem leaders are blocking in the view that it's merely a diversion designed to prevent a straight yes or no vote on escalation.

It remains to be seen whether Dem Senate leader Harry Reid will be able to muster the magic number of 60 votes tomorrow. Even if all Dem Senators except Joe Lieberman (who's expected to vote against cloture) and Tim Johnson (who's recovering from emergency brain surgery) vote for the measure, Dems still need 11 GOP Senators to come to their side. Stay tuned.