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FILE - Democratic candidate for Iowa's first congressional district Christina Bohannan speaks during a press conference on the steps of the Johnson County Courthouse in Iowa City, Iowa, July 29, 2024. (Nick Rohlman/The Gazette via AP, File)

FILE - Democratic candidate for Iowa's first congressional district Christina Bohannan speaks during a press conference on the steps of the Johnson County Courthouse in Iowa City, Iowa, July 29, 2024. (Nick Rohlman/The Gazette via AP, File)

FILE - Iowa Republican U.S. Congressional candidate Zach Nunn speaks to supporters during a Republican Party of Iowa election night rally, Nov. 8, 2022, in Des Moines, Iowa. (AP Photo/Charlie Neibergall, File)

FILE - Iowa Republican U.S. Congressional candidate Zach Nunn speaks to supporters during a Republican Party of Iowa election night rally, Nov. 8, 2022, in Des Moines, Iowa. (AP Photo/Charlie Neibergall, File)

FILE - Iowa 3rd Congressional District Democratic candidate Lanon Baccam speaks to supporters during a primary night rally, June 4, 2024, in Des Moines, Iowa. (AP Photo/Charlie Neibergall, File)

FILE - Iowa 3rd Congressional District Democratic candidate Lanon Baccam speaks to supporters during a primary night rally, June 4, 2024, in Des Moines, Iowa. (AP Photo/Charlie Neibergall, File)

FILE - Rep. Mariannette Miller-Meeks, R-Iowa, attends a panel discussion at the COP27 U.N. Climate Summit, in Sharm el-Sheikh, Egypt, on Nov. 11, 2022. (AP Photo/Thomas Hartwell, File)

FILE - Rep. Mariannette Miller-Meeks, R-Iowa, attends a panel discussion at the COP27 U.N. Climate Summit, in Sharm el-Sheikh, Egypt, on Nov. 11, 2022. (AP Photo/Thomas Hartwell, File)