"2024 Senate Battle: GOP's Rising Chances and Key Races to Watch"

The battle for control of the Senate in 2024 is expected to be tough for Democrats, who currently hold a narrow majority. Five key races to watch include Arizona, where Sen. Kyrsten Sinema's party switch has made her reelection uncertain; Montana, where Sen. Jon Tester faces a challenge from likely GOP nominee Tim Sheehy; Ohio, where Sen. Sherrod Brown is up against businessman Bernie Moreno for the GOP nomination; Wisconsin, where incumbent Sen. Tammy Baldwin is likely to face businessman Eric Hovde; and Pennsylvania, where incumbent Sen. Bob Casey faces a challenge from former hedge fund manager Dave McCormick.