The Nevada Republican, who has been embattled since revealing he had an affair with the wife of a former aide, was facing a possible primary challenge from Rep. Dean Heller (R). Heller is now expected to run for the open Senate seat.
Ensign was facing growing pressure to exit the Senate race, and he has mounting legal bills related to his admission of the extramarital affair. He is the eighth Senator and third Republican to announce retirement this Congress. To see who else is leaving, check out our Casualty List.
Roll Call Politics currently rates the Nevada Senate race as a Tossup.
Rep. Bill Cassidy has his blood drawn by Alesha Barbour during a free hepatitis screening in the Rayburn House Office Building hosted by the Congressional Viral Hepatitis Caucus to recognize "National Viral Hepatitis Testing Day."
Roll Call has launched a new feature, Hill Navigator, to advise congressional staffers and would-be staffers on how to manage workplace issues on Capitol Hill. Please send us your questions anything from office etiquette, to handling awkward moments, to what happens when the work life gets too personal. Submissions will be treated anonymously.