U.S. senator, R-S.C.
Details: He has been a key supporter and close friend of McCain's. They have worked closely on terrorism and other issues. A folksy conservative with a strong independent streak, he works well with Democrats. The first in his family to graduate from college, he served as an active-duty Air Force lawyer, then moved to private practice while remaining in the Reserves. In 1998, Graham attracted national attention as one of the House managers who brought the impeachment case against President Clinton to the Senate. He won his Senate seat in 2002. Democratic colleagues might (or might not) hesitate to attack a member of the "club."