Not that this wasn't predictable. After all, what leverage did Senate Democrats leave themselves for enforcing the agreement, given that they renounced the use of the "constitutional option" as part of the larger deal? And yet, as with so much else, the response seems to have been asymmetrical.
How asymmetrical? Get this: From the time of the invention of the cloture rule, during World War I, until the end of the Reagan administration, there were a total of 385 cloture motions filed. That's a span of about 70 years. But in the five and a half years since Republicans lost control of the Senate after the 2006 elections, there have been 359 cloture motions filed.
In fact, today's cloture vote was on the 83rd cloture motion filed in the 112th Congress. That's the third all-time highest number of cloture motions ever filed, and it's only May. And what two Congresses are the only ones ever to see more cloture motions filed? Well, it's the last two: the 110th and 111th. The two immediately following the Republicans' loss of control of the chamber.
Just something to keep in mind.