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| AL-Sen. Richard C. Shelby |
AK-Sen. Lisa Murkowski |
AZ-Sen. John McCain |
AR-Jim Holt challenger |
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| CA-Bill Jones challenger |
CO-Pete Coors open R |
CT-Jack Orchulli challenger |
FL-Mel Martinez open
D |
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| GA-Johnny Isakson open "D" |
HI-Cam Cavasso challenger |
ID-Sen. Mike Crapo |
IA-Sen. Chuck Grassley |
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| IL-Alan Keyes open R |
IN-Marvin Scott challenger |
KS-Sen. Sam Brownback |
KY-Sen. Jim Bunning |
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| LA-David Vitter open
D |
MD-E.J. Pipken challenger |
MO-Sen. Kit Bond |
NV-Richard Ziser challenger |
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| NH-Sen. Judd Gregg |
NY-Howard Mills challenger |
NC-Richard Burr open
D |
ND-Mike Liffrig challenger |
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| OH-Sen. George Voinovich |
OK-Tom Coburn open
R |
OR-Al King challenger |
PA-Sen. Arlen Specter |
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| SC-Jim DeMint open
D |
SD-John Thune challenger |
UT-Sen. Bob Bennett |
VT-Jack McMullen challenger |
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| WA-George Nethercutt challenger |
WI-Tim Michels challenger |
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