Is support for the "grand bargain" wobbling? Is the White House getting anxious? See this Corner post:

Someone following the immigration issue closely says White House representatives have been up on Capitol Hill in force today, trying to arm-twist as many "no" votes as possible. (Either the White House's claim of having 61 "yes" votes for closure is bunk, or they want a few extra for insurance.) For wavering senators, it's the phone lines ringing off the hook vs. the administration men sitting in their office lobbies.

Paging Chertoff!