UPDATE: A special district nominating convention selected Doug Campbell as the GOP candidate on August 19. Original post follows.

State Senator Waylon Brown announced on July 8 that he is resigning his Iowa Senate seat, effective July 10. Brown chairs the Iowa Senate Commerce Committee and has served as majority whip (the fourth-ranking position for Senate Republicans) since the 2023 legislative session. He was first elected to the legislature in 2016.

In a written statement, Brown touted various policy accomplishments but did not explain why he is stepping down. He said, “I look forward to my next chapter,” without indicating whether he has a new job lined up that would be incompatible with serving in the legislature. Bleeding Heartland’s efforts to reach Brown by phone and email were not successful. His campaign Facebook page was taken down the afternoon of July 8; no new content had been posted there since an appeal to voters on the day of the June 4 primary.

Although Iowa legislators occasionally resign during an election year—sometimes to accept a new job—it’s unusual for an incumbent to spend heavily on a tough primary campaign, then step down weeks after winning.

All seven Iowa legislators who faced competition for their party’s nominations prevailed in the June 4 elections. The outcome was a reversion to normal following a tumultuous 2022 cycle, in which six Iowa House Republicans lost their primaries. Two years ago, Iowa’s new political map forced three pairs of House members to face off against each other, and Governor Kim Reynolds endorsed challengers against several more GOP lawmakers who had opposed her “school choice” plan.

Crucially, Reynolds did not endorse any 2024 candidates running against incumbents. On the contrary, she backed one of the incumbents in a tough primary.

In addition, property rights proved to be a less potent issue here than in South Dakota, where fourteen Republican lawmakers lost to primary challengers on June 4.

Although Iowa saw no upsets, several of this year’s legislative races revealed that Republicans could be vulnerable to candidates from the right. The two challengers who came closest to knocking off incumbents were both vocal opponents of using eminent domain to build CO2 pipelines.

This post covers the primaries from the narrowest winning margin for the incumbent to the most comfortable victory.

UPDATE: Unofficial results show Brown won this primary by 2,546 votes to 2,273 (52.8 percent to 47.1 percent). Original post follows.

Two Iowa state senators and six state representatives face competition for their party’s nomination in the June 4 primary. The most intriguing match-up is unfolding in Senate district 30.

Two-term Republican State Senator Waylon Brown has a huge financial advantage and the backing of powerful interest groups. His opponent Doug Campbell, a retired pharmacist and former Mason City school board member, is running a low-budget campaign powered by grassroots outrage over a proposed CO2 pipeline.

The outcome should signal whether the controversy over property rights in rural Iowa is salient enough in GOP circles to overcome the advantages of incumbency. If Campbell prevails, Senate Republicans may feel pressure to consider eminent domain legislation in 2025, after blocking all such bills in the Commerce Committee for the last several years.