Democrats have found their escape route.
Watching some C-SPAN. The Democratic talking point now is that the Republican proposition is a political stunt, and illegitimate, so they're going to vote against it on that basis alone, totally disregarding the text of the bill. Of course, that leaves the withdrawal question hanging out there by itself, exactly where the Democrats want it, with nobody having to specifically support it, but still useful as a political weapon.
I think the Republicans should have pushed Murtha's bill through as is, which would have left the Democrats with no leg to stand on.
As it is, a close political escape.