1. Virginia (OPEN SEAT- John Warner)
Challenger: Mark Warner
Primary winner: Barack Obama
2. New Hampshire (John Sununu)
Challenger: Jeanne Shaheen
Primary winner: Hillary Clinton (Barack Obama split the delegates here 9-9)
3. New Mexico (OPEN SEAT- Pete Domenici)
Challenger: Tom Udall
Caucus winner: Hillary Clinton
4. Minnesota (Norm Coleman)
Challenger: Al Franken
Caucus winner: Barack Obama
5. Colorado (OPEN SEAT- Wayne Allard)
Challenger: Mark Udall
Caucus winner: Barack Obama
6. Oregon (Gordon Smith)
Challenger: Jeff Merkley
Primary winner: May 20th
7. Maine (Susan Collins)
Challenger: Tom Allen
Caucus winner: Barack Obama
8. Alaska (Ted Stevens)
Challenger: Mark Begich
Caucus winner: Barack Obama
9. North Carolina (Elizabeth Dole)
Challenger(s): Kay Hagan or Jim Neal
Primary winner: May 6th
10. Nebraska (OPEN SEAT- Chuck Hagel)
Challenger: Tony Raimando
Caucus winner: Barack Obama
11. Texas (John Cornyn)
Challenger: Rick Noriega
Primary/Caucus winner: March 4th
12. Oklahoma (James Inhofe)
Challenger: Andrew Rice
Primary Winner: Hillary Clinton
13. Idaho (OPEN SEAT- Larry Craig)
Challenger: Larry LaRocco
Caucus winner: Barack Obama
14. Kentucky (Mitch McConnell)
Greg Fischer or Bruce Lunsford
Primary winner: May 20th
15. Mississippi (Roger Wicker/Trent Lott)
Challenger: Ronnie Musgrove
Primary winner: March 10th
16. Alabama (Jeff Sessions)
Challenger: Vivian Figures
Primary winner: Barack Obama
17. Kansas (Pat Roberts)
Challenger: Lee Jones
Primary winner: Barack Obama
18. Tennessee (Lamar Alexander)
Challenger: Chris Lugo
Primary Winner: Hillary Clinton
19. Georgia (Saxby Chambliss)
Challenger(s): several, none strong.
Primary winner: Barack Obama
20. South Carolina (Lindsey Graham)
Challenger: none
Primary winner: Barack Obama
21. Mississippi (Thad Cochran)
Challenger: Erik Fleming
Primary winner: March 10th
22. Wyoming (Mike Barrasso)
Challenger: none
Caucus winner: March 8th
23. Wyoming (Mike Enzi)
Challenger: none
Caucus winner: March 8th
