Unfortunately for Mamdani, leftists are typically well-informed. But they made Mamdani support fashionable, and there’s no candidate further left than him, so I think they’re counting on him hanging onto enough of the original base.

It’s a stupid move though, that’s cost many Democrats their election. And even if he wins, his policies will naturally have to be more centrist, because now he won’t have the energized base to support leftist governance.