I think he means that the historical middle class, the ones who would be the middle class if not for the extremely wealthy, has been taken over by liberalism as the dominant political ideology. They’ve bought the lie that all we have to do is to get good representatives to replace the bad ones and vote our way out of this mess, not recognizing that “this mess” is a direct result of the system itself.

Really, it’s a terrible video title, and he’s not being clear in his premises, but he has a good point nonetheless.