A Republican congressman will run for the U.S. Senate against incumbent Democrat Mark Udall, the Denver Post reports:

Republican Congressman Cory Gardner is planning to drop his re-election bid and run for the U.S. Senate seat held by Democrat Mark Udall, The Denver Post has learned.

Gardner is expected to make an announcement in a few days, according to two Republicans who spoke on background.

Gardner is considered a rising star nationally in the Republican Party, and his likely accession into top leadership positions in the GOP-controlled House is one reason he earlier turned down efforts to convince him to jump into the race.

Sources tell THE WEEKLY STANDARD that a tentative agreement has been reached among Gardner, a two-term House member, and two of the current Republican Senate candidates. Ken Buck, a district attorney who lost the Senate race in 2010, will instead run for the House seat currently held by Gardner. Another candidate, Republican state senator Amy Stephens, will also drop her bid.

A recent poll showed Udall, who voted for Obamacare, in trouble for his reelection bid.

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