Democrats are unconvinced about Kamala Harris running for president in 2028 — with top party members refusing to row in behind her. NOTUS, a nonprofit a digital news outlet, spoke to several politicians on whether they would back the former vice president, and their responses were underwhelming. California Sen. Adam Schiff  declined to weigh in directly, saying simply: “That’s her decision.” Billionaire Mark Cuban served as a surrogate during Harris’s 2024 run against President Donald Trump. Getty Images for Inc. at Inc. Founders House at SXSW Massachusetts Sen. Elizabeth Warren echoed that sentiment. “I’m so focused on 2026, I’m just not there. I don’t have any thoughts about 2028,” she said. Others were more explicit about the uncertainty surrounding the field. “I can’t support anybody right now. It’s way too early. We’ve got to see what the field offers,” Louisiana Rep. Troy Carter  said. Behind the scenes, some Democrats have expressed sharper concerns.…