Zach Lahn has won the Republican primary for Iowa governor, upsetting the Trump-backed Congressman Randy Feenstra. Lahn, a farmer and businessman focused on a "Iowa First" platform, prevailed in Tuesday's election, setting up a competitive November contest against the unopposed Democratic nominee, State Auditor Rob Sand. This victory challenges recent trends favoring Trump-endorsed candidates, as Feenstra conceded late Tuesday. Lahn's platform addresses farmland ownership, youth retention, and healthcare, while Sand criticizes the state's economic policies and advocates for universal pre-K. The race is rated a tossup by The Cook Political Report, despite Iowa's recent leanings towards Republicans.