The 2006 United States Senate election in Rhode Island was held on November 7, 2006. Incumbent Republican Lincoln Chafee sought re-election to a second full term in office, the seat he had held since 1999 when he was appointed to fill the vacancy created by the death of his father John Chafee. He lost to Democratic nominee, former state Attorney General Sheldon Whitehouse by a 7-point margin. , this was the last time the Republican candidates won the counties of Bristol and Washington in a statewide election. Democrats won this Senate seat for the first time since 1970. Chafee would go on to run for governor and was elected in 2010. Democratic primary Candidates Carl Sheeler, Marine veteran Sheldon Whitehouse, former Attorney General of Rhode Island and former U.S. Attorney for the District of Rhode Island Christopher F. Young, activist and perennial candidate Campaign Whitehouse was endorsed by U.S. Senator Jack Reed, U.S. Congressmen Jim Langevin and Patrick J. Kennedy, as well as by former candidate Matt Brown. Sheeler, a former U.S. Marine, a business owner, and an adjunct professor of business, ran on a more progressive platform. Ultimately, however, Whitehouse would trounce his competition in the primary on September 12, winning his party's support by a large margin. Results Republican primary Candidates Lincoln Chafee, incumbent U.S. Senator Steve Laffey, Mayor of Cranston Campaign Incumbent Lincoln Chafee was one of the most liberal members of the Republican Party in the Senate by 2006, and was challenged for the Republican nomination by Laffey who had criticized Chafee for his liberal voting record in the Senate. In early 2006, the Club for Growth, a pro-tax cut political action committee, sent a series of mailings to Rhode Island Republicans attacking Chafee's positions and voting record. The national GOP supported Chafee in the primary campaign, believing that he was the most likely candidate to hold the seat in the general election. Senator Mitch McConnell of Kentucky, Senator John McCain of Arizona and First Lady Laura Bush appeared at fundraisers for Chafee, while Senator Bill Frist's PAC donated to Chafee. The National Republican Senatorial Committee also ran ads in the state supporting Chafee. Steve Laffey, however, picked up many endorsements from Republican town committees throughout Rhode Island, the national group Club for Growth, and former candidate for the party's Presidential nomination Steve Forbes. On July 10, 2006, the National Republican Senatorial Committee filed a complaint