Alphabetically by state:
Richard Lugar, Republican Senator from Indiana
Olympia Snowe, Republican Senator from Maine
Scott Brown, Republican Senator from Massachusetts
Kay Bailey Hutchison, Republican Senator from Texas
Orrin Hatch, Republican Senator from Utah
- - - - - - - -
Jon Kyl, Republican Senator from Arizona
Roger Wicker, Republican Senator from Mississippi -?
John Ensign, Republican Senator from Nevada
Bob Corker, Republican Senator from Tennessee - ?
John Barrasso, Republican Senator from Wyoming
Is this the full list?