The Washington Post and Indianapolis Star called the race shortly after polls closed at 7 p.m. Eastern.

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The establishment favorite, Young held off a tough challenge from a lawmaker known for bucking party leaders.

Young was backed by the U.S. Chamber of Commerce and also had a money edge.

Stutzman received support from major Tea Party groups including the Tea Party Express, Club for Growth, FreedomWorks and the Senate Conservatives Fund.

November will not the first time Young and Hill go head-to-head. In 2010, Young defeated Hill in his reelection bid in the House, in a year of major gains for Republicans.

They tout Hill, who served five terms in the House, as someone who could be a tough opponent in the general election.