I think after hearing him on television the past couple of days... that he is hoping the senate dems break the deal and support a filibuster, so he can vote to nuke it and get back in good graces. I think he expected some flack... but didn't expect to take the hits he's been getting.
I also think he won't be re-elected.
Well, there are other things he can do to try to get back in some good graces, like take a lead role in support of Bolton, for starters.