In a footnote to the brutal politics of the campaign, Republican-turned- independent Lincoln Chafee was elected governor of Rhode Island. Obama campaigned in the state in the campaign's final week. But he declined to endorse the Democratic candidate, Frank Caprio, out of what the White House said was respect for Chafee, who had endorsed the president in his own presidential race two years ago.
A Republican takeover of the House ushers in a new era of divided government after two years in which Obama and fellow Democrats pushed through an economic stimulus bill, a landmark health care measure and legislation to rein in Wall Street after the near collapse of the economy in 2008.
Paul's triumph in Kentucky completed an improbable rise for an eye surgeon making his first race. He drew opposition from the Republican Party establishment when he first launched his bid, then struggled to adjust to a statewide race with Attorney General Jack Conway.
Rubio, also running with tea party support, won with 49 percent of the vote in a three-way race in Florida, months after he forced Gov. Charlie Crist to leave the Republican Party and run as an independent. Democratic Rep. Kendrick Meek ran third.
But a third tea party-backed candidate, O'Donnell, who went from a virtual unknown to primary winner to fodder for late-night comedians in the span of a few months, lost overwhelmingly to Democrat Chris Coons in Delaware. Republicans had counted on taking the seat from the Democrats early this year, but that was before O'Donnell defeated veteran Rep. Mike Castle in a September primary. Democrat John Carney easily won the seat that was Castle's for nearly two decades.
Not all the Republican newcomers were party crashers.
In New Hampshire, Republican Kelly Ayotte won a Senate seat, defeating Democratic Rep. Paul Hodes. Former Bush administration official Rob Portman won a seat in Ohio, and Rep. Jerry Moran won in Kansas and Rep. Roy Blunt in Missouri.
Democratic Sen. Patrick Leahy of Vermont was re-elected to his seventh term and Barbara Mikulski her fifth. New York Sens. Charles Schumer and Kirsten Gillibrand also won, as did Sen. Ron Wyden in Oregon and Boxer in California In Hawaii, Democratic Sen. Daniel Inouye was elected for a ninth time to the seat he has held since 1962.
Republican Sen. Jim DeMint, who won a second term in South Carolina, has been working to establish a nationwide standing among conservatives. He was instrumental in supporting tea party challengers in several primaries this spring and summer at a time the GOP establishment was backing other candidates.
In Alabama, Sen. Richard Shelby was re-elected easily, as were Republican Sens. Tom Coburn in Oklahoma, Richard Burr in North Carolina, John Thune in South Dakota, Johnny Isakson in Georgia, David Vitter in Louisiana, John McCain in Arizona, Chuck Grassley in Iowa and Mike Crapo in Idaho.
AP writers Thomas J. Sheeran in Cleveland, Rasha Madkour in Miami, Wayne Parry in Bayville, N.J., Bruce Shipkowski in Trenton, N.J., Mike Glover in Des Moines, Iowa, Thomas J. Sheeran in Parma Heights, Ohio, Jeff Baenen in Minneapolis, Deepti Hajela in New York and Mark S. Smith in Washington contributed to this report.
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