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Since the 1972 congressional elections, which is as far back as our database of retirements goes, the Senate has typically seen about six retirements in each Congress. Beginning in 2009, however, senators have been leaving at a significantly higher rate. Before the four retirements— so far — in this legislative session, there were 11 in the 113th Congress, 10 in the 112th, and eight in the 111th.
The 4 currently US Senators which have announced their retirements/rresignations are Sen Reid (D)(NV), Sen Coats (R) (IN), Sen Mikulski (D) (MD), Sen Boxer (D) (CA) & Sen Vitter (R) (LA).
NOTE 1: This market is only asking if more 114th Congress Senators VOLUNTARLY retire or resign than the 11 who retired / reesigned in the 113th Congress.
(See: http://politics.nytimes.com/congress/members/113/senate/departures )
NOTE 2: Originator will not participate in this market for 6 hours after opening, or after 2 players have participated, whichever comes first.