Here's the statement from Sen. John Ensign, (R-NV). Note that he does not mention why he's decided to go public now. He gives clues about the identity of the woman -- it's fairly obvious, given that his staff is telling reporters that the woman was a campaign aide who was married to member of Ensign's staff. (Just Google it.)
"I came home to Nevada to come forward and explain to the citizens of our state something that I was involved in about a year ago. Last year I had an affair. I violated the vows of my marriage. It is the worst thing I have ever done in my life. If there was ever anything in my life that I could take back, this would be it. "I take full responsibility for my actions. "I know that I have deeply hurt and disappointed my wife Darlene, my children, my family, my friends, my staff and others who believed in me. To all of them, especially my wife, I am deeply sorry. I am truly blessed to have a wife who has forgiven me. We sought counseling last year and have built a stronger marriage -- stronger than ever. "I will not mention any names but the woman who I was involved with and her husband were close friends and both of them worked for me. Our families were close. That closeness put me into situations which led to my inappropriate behavior. We caused deep pain to both families and for that I am sorry. "I am committed to my service in the United States Senate and my work on behalf of the people of NV. "Thank you."