Here are the 2008 Senate Races:

AK-Sen: Stevens vs Begich
CO-Sen: Schaffer vs Udall
DE-Sen: O'Donnell vs Biden
GA-Sen: Chambliss vs Martin
ID-Sen: Risch vs LaRocco
IL-Sen: Sauerberg vs Durbin
IA-Sen: Reed vs Harkin
KS-Sen: Roberts vs Slattery
KY-Sen: McConnell vs Lunsford
LA-Sen: Kennedy vs Landrieu
ME-Sen: Collins vs Allen
MA-Sen: Beatty vs Kerry
MI-Sen: Hoogendyk vs Levin
MN-Sen: Coleman vs Franken
MS-Sen: Cochran vs Fleming
MS-Sen: Wicker vs Musgrove
MT-Sen: Kelleher vs Baucus
NE-Sen: Johanns vs Kleeb
NH-Sen: Sununu vs Shaheen
NJ-Sen: Zimmer vs Lautenberg
NM-Sen: Pearce vs Udall
NC-Sen: Dole vs Hagan
OK-Sen: Inhofe vs Rice
OR-Sen: Smith vs Merkley
RI-Sen: Tingle vs Reed
SC-Sen: Graham vs Conley
SD-Sen: Dykstra vs Johnson
TN-Sen: Alexander vs Tuke
TX-Sen: Cornyn vs Noriega
VA-Sen: Gilmore vs Warner
WV-Sen: Wolfe vs Rockefeller
WY-Sen: Enzi vs Rothfuss
WY-Sen: Barasso vs Carter

Map and Polling breakdown