FILE - Sen. Deb Fischer, R-Neb., speaks during a hearing, March 14, 2023, in Washington. (AP Photo/Alex Brandon, File)

FILE - Dan Osborn, Independent candidate for U.S. Senate, speaks during a news conference announcing he will not accept any party or political endorsements, May 15, 2024, at his Omaha, Neb. home. (Nikos Frazier/Omaha World-Herald via AP, File)