In interviews, lawmakers and strategists tried to explain Kamala Harris’s defeat, pointing to misinformation, the Gaza war, a toxic Democratic brand and the party’s approach to transgender issues.
In the wake of Donald J. Trump’s resounding victory, many Democrats are casting President Biden as a one-term president who set his party on a path to failure in 2024.
Democrats picked up two seats in New York and defended others in Michigan and New Mexico, but Republican gains have narrowed their path, setting up a potential G.O.P. trifecta.