Mamdani will be an entertaining test of the DSA, at minimum. The right wing of DSA is ascendant with his win in the primary and their very silly convention votes align with it. The right wing of the DSA's approach to electoralism is to run anyone willing snd endorse and campaign for anyone that asks, with zero discipline. So if Mamdani is not, as a single person, very disciplined himself and building up a private security force, he will disappoint and there will be internal struggle.