Sen. Jeff Bingaman (D-NM) is expected to announce his retirement shortly. Mr. Bingaman will be the fourth Democratic incumbent to decide not to seek re-election next year.
President Obama won New Mexico comfortably in 2008 and the state tilts Democratic in presidential election years. But Sen. Bingaman was all but a lock for re-election. Democrats will now have to spend resources to defend the seat.
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