In the New York race, Mrs. Clinton’s landslide carried its own broader significance. By performing strongly among a liberal, antiwar primary electorate, she showed that her vote for military action in Iraq in 2002 did not damage her political standing as it did with Senator Joseph I. Lieberman, Democrat of Connecticut, who lost his bid for re-nomination last month to an antiwar candidate, Ned Lamont.

Mrs. Clinton’s little-known opponent in New York, a union organizer named Jonathan Tasini, tried to tap into voter anger over Iraq, yet he had little money and did not effectively turn the race into a message-sending moment about the war.

“Clinton’s work ethic, her lack of enemies, and her fund-raising help for other Democrats have insulated her from party criticism, including on Iraq,” said Ken Sherrill, a political scientist at Hunter College. “I got a taped phone call from Susan Sarandon urging support for Tasini, but that’s all I really heard about him.”