Let's assume that enough Republicans refuse to sign on to the filibuster effort being led by Sens. Ted Cruz (R-Texas) and Rand Paul (R-Ky.). (At the moment, at least eight Republican Senators are on the record saying they will vote for cloture.) That means that if Reid can keep all 55 Democratic-caucusing Senators in line, he should have more than the 60 votes he would need to end unlimited debate -- bringing the bill to the floor and allowing amendments to it to be offered before a final vote on passage.