I would argue that Mamdani, AOC, Sanders, and any others who follow that same path are all parts of a different party that is simply forced to run on the Democrat ballot. Meanwhile the true Democrats and Republicans are two wings of the same Corprocrat party who is there to progress the interests of corporations and the only divide is on what to do with the 'remaining' population.

Get money out of politics.

It's not some eldritch knowledge.

In Europe he'd be center left

He lost them with "don't take corpo checks"