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Sen. Tom Coburn (R-Okla.)

Sen. Tom Coburn (R-Okla.), a fiscal conservative who was served in Congress since 1995, said Jan. 16 that he will end his term early and retire after 2014. Though he is battling prostate cancer, Coburn said in a statement that the decision "isn't about my health, my prognosis or even my hopes and desires."Susan Walsh / Associated Press