Shaking up 2012: US senators who aren't running for reelection

So far, 10 senators have announced that they will retire at the end of of their terms rather than seek reelection. With the 2012 campaigns not far off, the departures of these seven Democrats (well, one is an Independent, technically) and three Republicans are shaking things up. Here's how.

- Aaron Couch, Contributor, Andrew Mach, Contributor

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U.S. Sen. Jon Kyl, R-Ariz., announces his retirement on Feb 10, 2011. Kyl was elected to the Senate in 1994, and plans on remaining in office until his term runs out in Jan. 2013. (P Photo/Matt York)

6. Jon Kyl (R) of Arizona

Not since 1994 have Arizonans seen an election with an open Senate seat, but that's what they'll have with Senator Kyl’s departure. Pundits say possible candidates are Republican US Rep. Jeff Flake and Democratic Homeland Security Secretary Janet Napolitano.

Kyl, the Senate minority whip, was elected to the Senate in 1994.