From Ballot Access News:
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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.