Here are all of them up in 2010, we have a number of targets too:
Blanche Lincoln (Arkansas)
Barbara Boxer (California)
Ken Salazar (Colorado)
Daniel Inouye (Hawaii)
Barrack Obama’s replacement chosen by the Governor of Illinois after his resignation from the Senate in January to become President (Illinois)
Evan Bayh (Indiana)
Barbara Mikulski (Maryland)
Harry Reid (Nevada)
Chuck Schumer (New York)
Byron Dorgan (North Dakota)
Ron Wyden (Oregon)
Patrick Leahy (Vermont)
Russ Feingold (Wisconsin)
Richard Shelby (Alabama)
Lisa Murkowski (Alaska)
John McCain (Arizona)
Mel Martinez (Florida)
Johnny Isakson (Georgia)
Mike Crapo (Idaho)
Chuck Grassley (Iowa)
Jim Bunning (Kentucky)
David Vitter (Louisiana)
Kit Bond (Missouri)
Judd Gregg (New Hampshire)
Richard Burr (North Carolina)
George Voinovich (Ohio)
Tom Coburn (Oklahoma)
Arlen Specter (Pennsylvania)
Jim DeMint (South Carolina)
John Thune (South Dakota)
Bob Bennet (Utah)
Kansas run, now filled by Sam Brownback, but incumbent won’t seek re-election
Christopher Dodd (Connecticut)
I don’t think Shelby, Coburn or DeMint will lse to Democrats. But no seat is 100% safe.
Obama has already resigned from the Senate...presumably the governor will name his replacement before January so that the new senator will have more seniority than colleagues who have to wait until the first day of the new Congress.