U.S. Sen John Ensign, R-Nev., accompanied by his wife Darlene and son Trevor, announces he will not be a candidate for re-election, during a news conference in Las Vegas on Monday, March 7, 2011. (AP Photo/Oskar Garcia)

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Sen. Ensign won't seek re-election for 2012

• By ncs-import
• March 7, 2011