WASHINGTON (Reuters) -U.S. Senator Jon Tester of Montana will run for reelection, he said on Twitter on Wednesday, in a win for Democrats who are defending seats in several battleground states in 2024 as they seek to defend their thin 51-49 majority. Tester, who has represented Montana in the U.S. Senate since 2007, is a reliable moderate who has won three tight races in the past in the increasingly Republican state. “Montanans need a fighter that will hold our government accountable and demand Washington stand up for veterans and lower costs for families,” Tester said in a Twitter post declaring his reelection campaign.