WASHINGTON (AP) — Democrats are trying to win back the Senate. But they are fighting over how to do it. Senate Minority Leader Chuck Schumer is backing establishment candidates in key races. Some of his own senators are breaking ranks and endorsing more progressive challengers. The clashes are playing out in Maine, Michigan and Minnesota. They reflect deeper frustration after the 2024 election and growing doubts about the party’s strategy. Allies argue Schumer is recruiting strong candidates and expanding the map. Critics say the old playbook no longer works. The outcome of the midterms could decide both the majority and Schumer’s future as leader.