It sometimes takes a bit of shamelessness to be a successful politician. But Senator Strom Thurmond (R-S.C.) may take the prize by coming out in support of term limits for members of Congress. Thurmond, 90, is the senior member of the Senate, where he has served since 1954. Other veterans signing up with U.S. Term Limits, an advocacy group, include Senators Bob Dole (R-Kan.) and Jesse Helms (R-N.C.) and Representatives Glenn English (D-Okla.) and Dan Glickman (D-Kan.). The four have a total of 78 years of service.