They would have to expose their votes on this awful legislation with no guarantee it would pass.
Also, it will sow the seeds of mistrust among the democrats themselves because they will wonder who will break ranks leaving them exposed even further.
I am always having to respond to Eeyorism amongst certain FReepers (not you!) who say "Give up, we're doomed, the Dems are all crooks, the GOP's are all wobblers," etc. etc.
But I always say, you can only work with the Congresscritters you have, not the one you wish you had.
And I also say cynicism is an excuse for people who just don't want to exert themselves. You should never give yourself the miserable luxury of saying, "There's no hope."