| 14 Democratic incumbents - 13 re-elected | 12 Republican incumbents - 0 defeated |
| 5 Democratic open seats (FL, GA, LA, NC, SC) - 0 held | 3 Republican open seats (CO, IL, OK) - 1 held |
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| AL-Wayne Sowell challenger | AK-Tony Knowles challenger | AZ-Stu Starky challenger | AR-Sen. Blanche Lincoln |
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| CA-Sen. Barbara Boxer | CO-Ken Salazar open R | CT-Sen. Christopher Dodd | FL-Betty Castor open D |
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| GA-Denise Majette open "D" | HI-Sen. Daniel Inouye | ID-only write in | IA-Art Small challenger |
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| IL-Barack Obama open R | IN-Sen. Evan Bayh | KS-Lee Jones challenger | KY-Daniel Mongiardo challenger |
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| LA-Chris John open D | MD-Sen. Barbara Mikulski | MO-Nancy Farmer challenger | NV-Sen. Harry Reid |
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| NH-Granny D Haddock challenger | NY-Sen. Chuck Schumer | NC-Erskine Bowles open D | ND-Sen. Byron Dorgan |
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| OH-Eric Fingerhut challenger | OK-Brad Carson open R | OR-Sen. Ron Wyden | PA-Joe Hoeffel challenger |
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| SC-Inez Tenenbaum open D | SD-Sen. Tom Daschle | UT-Paul Van Dam challenger | VT-Sen. Patrick Leahy |
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| WA-Sen. Patty Murray | WI-Sen. Russ Feingold |
Compiled by Eric M. Appleman/Democracy in Action.