"From 1917 to 1970, the majority [in the U.S. Senate] sought cloture fifty-eight times. Since the start of Obama's first term, it has sought cloture more than two hundred and fifty times....
"No President in American history has seen his initiatives filibustered with anything even approaching the frequency with which the tactic has been used against Obama. But it wasn’t until this past December that the practice truly reached its apotheosis: the self-filibuster, which Mitch McConnell, the Republican Minority Leader in the Senate, used to derail a piece of legislation that he had proposed, after he realized that its passage might be favorable to the Democrats. (“I’ve got whiplash,” said Senator Claire McCaskill, a Democrat from Missouri.)"
(Unfortunately a subscription to the New Yorker is required to read the rest of the article here.)