The seat was left open by the four-term incumbent Republican, Mark Green, who unsuccessfully ran for Governor of Wisconsin.

Senator Arlen Specter, the four-term Republican from Pennsylvania, won a narrow 16,000-vote primary victory over Representative Patrick J. Toomey.

Never mind that his opponent, Senator Arlen Specter, is a four-term Republican who has been endorsed by the nation's conservative-in-chief, President Bush.

A four-term Republican who is seen as a national leader on welfare, he went on to say that Ms. Crawford's problems made her achievements all the more impressive.

Representative J. D. Hayworth, a four-term Republican from the Sixth Congressional District, said he was considering running for governor next year.

Senator Thad Cochran, a four-term Republican, overwhelmed his only opponent, Shawn O'Hara of the Reform Party.

In one, Pete Sessions, a four-term Republican, raised $950,000, almost twice as much as his Democratic opponent, Martin Frost, a 13-term Democrat.

A four-term Republican from the strongly conservative 10th District in northeastern Pennsylvania, Sherwood had run unchallenged by Democrats in 2002 and 2004.

Senator Thad Cochran, a four-term Republican who is the Senate's leading proponent of missile defense, was viewed as so unstoppable that no Democrat took the field against him.

Senator John W. Warner, the four-term Republican who is widely revered in the state, faced no major-party opponent and strolled to re-election.