FILE - This combination of images shows from left, Sen. Sherrod Brown, D-Ohio, chairman of the Senate Committee on Banking, Housing, in Washington, on Dec. 7, 2022, and Republican opponent Bernie Moreno, in Vandalia, Ohio, on March 16, 2024. (AP Photo Mariam Zuhaib and AP Photo Jeff Dean, File)
FILE - This combination of images shows from left, Democratic Maryland Senate candidate Angela Alsobrooks in Chicago, Aug. 20, 2024, and Republican opponent, former Maryland Gov. Larry Hogan in Annapolis, on Aug. 27, 2024. (AP Photo Erin Hooley, left; and AP Photo Stephanie Scarbrough, File)
FILE - This combination of images shows, from left, Republican Arizona Senate candidate Kari Lake on July 30, 2024, and opponent, U.S. Rep. Ruben Gallego, D-Ariz., on Oct, 9, 2024, both in Phoenix. (AP Photo Ross Franklin, left; and Cheryl Evans/Arizona Republic via AP, File)
FILE - This combination of images shows from left, Sen. Ted Cruz, R-Texas, in Oklahoma City, on April 13, 2022, and Democratic opponent, Rep. Colin Allred, D-Texas, in Chicago, on Aug. 22, 2024. (AP Photo Sue Ogrocki, left; and Paul Sancya, File)
FILE - This combination of images shows from left, Republican Pennsylvania Senate candidate David McCormick, left, in Pittsburgh, on Sept. 21, 2023, and opponent, Sen. Bob Casey, D-Pa., in Chicago, on Aug. 22, 2024. (AP Photo Gene J. Puskar, left; and AP Photo Paul Sancya, File)
FILE - This combination of images shows from left, Independent Nebraska Senate candidate Dan Osborn, left, in Omaha, Neb., on May 15, 2024, and opponent, Sen. Deb Fischer, R-Neb., in Washington on March 14, 2023. (Nikos Frazier/Omaha World-Herald via AP, left; and AP Photo Alex Brandon, File)
FILE - This combination of images shows from left, Republican Michigan Senate candidate Mike Rogers in University Center, Mich., on Oct. 3, 2024, and opponent U.S. Rep. Elissa Slotkin, D-Mich., in Detroit, on Sept. 2, 2024. (AP Photo Alex Brandon, left; and AP Photo Paul Sancya, File)
FILE - This combination of images shows from left, U.S. Sen. Jon Tester, and opponent, Republican Montana Senate candidate Tim Sheehy, during a debate in Missoula, Mont., on Sept. 30, 2024. (Ben Allan Smith/The Missoulian via AP, File)