Cloture is a motion to stop debate and proceed to a vote. In this particular case, the cloture motion was made by the proponents of the administration bill to stop all that amending, stop all that debating and just vote on the president's bill. If you tend to judge politicians by the company they keep, run down the list of senators voting against cloture: you'll find 28 D's (including Obama) and the one I (good ol' Bernie Sanders) and nary a single R.