Kyl has served as Arizona's junior Senator since 1995, and is presently the second highest-ranking Republican in that chamber. Last year, he was named by Time Magazine as one of the 25 leaders in the world with most influence.
He discussed his decision with also-retiring Sen. Joe Lieberman (I-CT), and Kyl sees the possibility of a sort of caucus of retiring Senators (5 have announced so far) that might be able to get things moving on issues such as entitlement reform, in a way that politically-active Senators might not be able to do.
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