How does the GOP record of obstruction in the Senate compare to past Congresses? McClatchy does the legwork to get the numbers:

Nearly 1 in 6 roll-call votes in the Senate this year have been cloture votes. If this pace of blocking legislation continues, this 110th Congress will be on track to roughly triple the previous record number of cloture votes — 58 each in the two Congresses from 1999-2002, according to the Senate Historical Office.

McClatchy also puts the filibuster in historical context and notes that the Democrats used it more in recent years than in the past. In short, we've been on an upward trend for almost two decades, but the GOP is on pace to use the filibuster more than ever before in the history of the Senate.