Republican Tracey Mann, a real estate agent, will announce his candidacy on April 4 for Kansas’ open 1st District.

Mann will join an already crowded GOP field to succeed Republican Rep. Jerry Moran, who is running for governor.

Republicans Tim Huelskamp, a state senator, businessman Tim Barker, former senate aide Rob Wasinger, and educator Sue Boldra are each campaigning for the Republican nomination.

Voters in the largely rural district supported John McCain for president with 69 percent of the vote, according to a CQ Politics analysis.