A Cheyenne natural resources attorney, Hageman will now enter Congress among freshmen legislators who typically must jostle for desired committee assignments.
Barnes will face one of three Republican candidates, Boyd Wrede, Brian Kozak, or Don Hollingshead in November. Democrat Jess Fresquez is also on the ballot for Laramie County Sheriff.
Barnes will appear on the November 8 general election ballot, along with Democratic candidate Fresquez and whichever candidate wins the GOP nomination for Laramie County Sheriff.