Open Seats and Special Elections
Normally the winner of the Senate seat in 2004 would be running for reelection in 2010. This page lists races where that is not the case, either because the 2004 winner is retiring in 2010 or because he or she has resigned and a special election is being held in 2010. Seats like these tend to be more competitive than usual. The colors represent the incumbent party.
Also check out the page discussing the All Senate races.
| State | Incumbent | Party | Type | Reason for open seat/special election |
| CO | Michael Bennet | Dem | Reg. | Appointed after Ken Salazar became Sec. of the Interior |
| DE | Ted kaufman | Dem | Spec. | Appointed to Joe Biden's seat; retiring in 2010 |
| FL | Mel Martinez | GOP | Reg. | Retiring; would be in for a very tough fight |
| IL | Roland Burris | Dem | Reg. | Appointed to Barack Obama's seat |
| KS | Sam Brownback | GOP | Reg. | Retiring; running for governor |
| MO | Kit Bond | GOP | Reg. | Retiring; had enough and would be in for a tough battle |
| NH | Judd Gregg | GOP | Reg. | Retiring after appointment flap |
| NY | Kirsten Gillibrand | Dem | Spec. | Appointed when Hillary Clinton became Sec. of State |
| OH | George Voinovich | GOP | Reg. | Retiring; had enough and would be in for a tough battle |
| PA | Arlen Specter | Dem | Reg. | Specter ran in 2004 as a Republican, now as a Democrat |
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