Cindy Sheehan, who has crusaded nationally against the war in Iraq since her son was killed there, called on antiwar activists yesterday not to support Senator Hillary Rodham Clinton, who is seeking re-election next year. "I believe that any candidate who supports the war should not receive our support," Ms. Sheehan told The Associated Press in an interview. "It doesn't matter if they're Senator Clinton or whoever."

Though Ms. Sheehan has criticized Mrs. Clinton's position on the war in the past, this is the first time she has urged people to withhold support from the senator.

Senator Clinton voted to authorize the president to wage war in Iraq, but she has been critical of the way his administration has conducted the war. Still, she has not called for either a withdrawal of American troops or a timetable for their withdrawal. Mrs. Clinton's office declined to comment on Ms. Sheehan's remarks.

Ms. Sheehan made headlines over the summer when she camped outside President Bush's vacation home in Crawford, Tex., to demonstrate her opposition to the war.