(NEWSER) - John Ensign, a Republican senator from Nevada said to be considering a presidential run in 2012, admitted today that he had an extramarital affair with a campaign staffer, reports Chris Cillizza of the Washington Post. "It's absolutely the worst thing I've ever done in my life," he said at a press conference. "I'm very sorry." His wife, Darlene, backed her husband and said their "marriage has become stronger" in a statement. More»