Former Montana U.S. House candidate and Republican Stacy Zinn will replace Bill Mercer in the Montana Legislature.
Zinn was selected unanimously Tuesday by the Yellowstone County Commission to serve the final 13 months of Mercer’s two-year term in House District 52. Mercer resigned in October to accept a Montana U.S. District Court judgeship following confirmation by the U.S. Senate.

A retired U.S. Drug Enforcement Administration agent, Zinn had formed a campaign committee last spring to run for the north Billings district, which threads through the rimrock neighborhoods of Palisades, Zimmerman and Ironwood.
“When this opportunity came up, I still wanted to serve. I still wanted to be productive,” Zinn told Montana Free Press on Tuesday.
In the 2024 Republican U.S. House primary for Montana’s eastern district, Zinn won the second-most votes in Yellowstone County, finishing behind now-U.S. Rep. Troy Downing. The nine-candidate congressional primary was Zinn’s first time running for office, though she had built a profile as a public speaker on drug enforcement and immigration issues.
Zinn said of her failed campaign a year ago that eastern Montanans wanted a candidate with time in public office and a voting record.
“In the congressional race, people would tell me I hadn’t checked that box on voting, ‘We want to see how you would vote,’” Zinn said.
Zinn told Yellowstone County commissioners in her bid for Mercer’s seat that her experience with law enforcement, the courts and tribal law would benefit the Legislature.
Other nominees to replace Mercer included former state House Speaker Pro Temp Rhonda Knudsen. Knudsen, a Republican, represented the northeast corner of Montana in the 2023, 2021 and 2019 legislatures. In 2024, she lost a primary bid to represent the same Hi-Line communities in the state Senate. She is the mother of Montana Attorney General Austin Knudsen.
Knudsen told commissioners that she was “spurred on by constituents and citizens here in Billings” to run for Mercer’s seat.
The third nominee was Jenna McKinney, a Billings resident who previously worked as a field representative for U.S. Sen. Steve Daines and district director for former U.S. Rep. Matt Rosendale, both Republicans.
Before the vote commission vote, several Billings Republican women spoke in support of Zinn, who was also elected vice chair of the Montana GOP in June.
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