From Ballot Access News:
The Kansas Libertarian Party is ballot-qualified and nominates by convention. Its original nominee for U.S. House, 4th district, David Moffett, recently dropped out of the race because of ill health. The party has the right to choose a replacement nominee, up until September 20.
According to this story, the Kansas Libertarian Party is considering replacing Moffett with Wink Hartman, and Hartman is considering whether to accept. Hartman ran in the Republican primary on August 4 for the same seat, and polled 22.8% in a five-person race. The winner of the Republican primary is Mike Pompeo. The seat is open because the Republican incumbent, Todd Tiahrt, did not run for re-election; instead he ran for U.S. Senate, but lost the Republican primary.
The 4th district is centered on Wichita. Hartman is a successful businessman who already spent $1,000,000 on his primary campaign.