On the big morning, another keyed-in Senate source agrees with the “more likely to fail” forecast of last night, but adds:

I think your source’s assessment is right but remember that there’s actually a 3rd 60 vote hurdle built in — the budget point of order in the post-cloture timeframe (at the very end). So, a senator can give the process one more chance knowing that if germane amendments that receive post cloture votes go badly, he can still bail out. Of course, if it only gets 60, it is difficult to see how folks hang in there. These things have momentum. It also seems that Vitter, et al, got the better end of the argument today with their colleagues re: being rolled. That affected some old bulls, in particular Domenici and Gregg.