Republican U.S. Senator Jon Kyl of Arizona announced today that he won’t run for re-election in 2012.
Kyl, the second-ranking Senate Republican leader, made the announcement at a news conference in Phoenix. He is serving his third six-year term.
He is the fifth senator so far to decide against seeking another term next year.
Kyl, 68, served four terms in the House before his 1994 election to the Senate, where he has been a key architect of Republicans’ agenda in recent years, including the push for tax cuts.
Potential Republican candidates to succeed Kyl include Representative Jeff Flake. Homeland Security Secretary Janet Napolitano, a former Arizona governor, is seen as a possible Democratic contender.