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Christine O'Donnell beats Rep. Mike Castle in Delaware Republican Senate primary

Christine O'Donnell, a "tea party"-backed insurgent candidate, stunned the GOP establishment by beating nine-term Rep. Mike Castle for the Delaware Senate nomination.

Lamontagne was backed by some tea party activists, Sen. Jim DeMint (R-S.C.) and the conservative Union Leader newspaper in Manchester. But he also has long been active on behalf of the state party in New Hampshire and is a lawyer at one of the most prestigious firms in the state.

Lamontagne has a history of upsetting the establishment while running underfunded campaigns. In 1996, he was the surprise winner of the Republican gubernatorial primary, beating a heavily favored establishment candidate. As of late August, he had spent about $400,000 to Ayotte's roughly $2 million.

The crowded field also included businessman Bill Binnie, who had put more than $5 million of his own money toward his candidacy as of the last reports. He sought to portray himself as the moderate alternative in a state with a tradition of moderate Republicanism, but too late to become a real factor, strategists said.

The winner of the Republican Senate primary in New Hampshire will face Rep. Paul W. Hodes (D) in November.

The other states voting Tuesday included Maryland, Massachusetts, Rhode Island and Wisconsin, as well as the District.

In Massachusetts, the gubernatorial campaign has been heated for months, with three major candidates sparring and with national involvement from the two major parties.

Republicans consider first-term Gov. Deval L. Patrick (D) highly vulnerable and have pinned their hopes on businessman Charlie Baker. The third candidate, independent Tim Cahill, complicates the GOP's hopes of picking up the seat.

In Rhode Island, Republicans have held the governorship for the past 16 years, but that could change this year.

Gov. Donald Carcieri is term-limited and the November election is likely to be a contest between Democrat Frank Caprio, the state treasurer, and former Republican senator Lincoln D. Chafee, who is running as an independent. The GOP primary pitted Carcieri adviser John Robitaille against accountant Victor Moffitt.

In Wisconsin, businessman Ron Johnson won the GOP Senate primary and the right to challenge Sen. Russell Feingold (D) in what is expected to be an unexpectedly close race.

Wisconsin also could see a party change in the governor's mansion

Milwaukee Mayor Tom Barrett faced no opposition in his Democratic primary. Scott Walker, the Milwaukee County executive, won the Republican primary easily.

Staff writer Amy Gardner contributed to this report.


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