Probably a tad premature, but if Mamdani wins the NYC mayorship and then actually does what he says he's going to do, I'll be willing to concede it's something of a turning point. Right now all we have is a young handsome man with personal charisma and a whole lot of great promises.
We had that same thing in 2008, and every one of those promises was broken even though that man had the power to make real change.