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Massie heads into the general election in solid shape to replace retiring Rep. Geoff David (R-Ky.). The district leans heavily Republican, and Democrats have not indicated they intend to contest the seat.

Massie's win was an important victory for fiscal conservatives and the Club for Growth coming off a stinging loss last week in Nebraska, where the Club's favored candidate, state Treasurer Don Stenberg, suffered an embarrassing loss to Deb FischerDebra (Deb) Strobel FischerGOP senators pan debate: 'S---show,' 'awful,' 'embarrassment' Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections Google, Apple, eBay to meet virtually with lawmakers for tech group's annual fly-in MORE (R), a relative unknown state senator.

"Tom Massie will fight to cut spending, limit government, and restore the constitution," said Chris Chocola, the group's president. "The Club for Growth PAC was proud to play a role in Tom’s victory tonight and we look forward to seeing him in Congress next year.”

An entrepreneur and inventor, Massie serves as Lewis County's judge-executive, a position similar to a county commissioner. A fiscal conservative, Massie pledged during his campaign not to participate in federal healthcare or retirement programs if elected to the House.

In another closely watched House primary in Kentucky, Republican Andy BarrAndy BarrReclaiming the American Dream Powell, Mnuchin stress limits of current emergency lending programs McConnell holds 12-point lead over Democratic challenger McGrath: poll MORE won his party's nomination for a rematch against Rep. Ben Chandler (D-Ky.) in November. Barr came within 700 votes of unseating Chandler in 2010, and Republicans have made Chandler a top target for 2012.