Well they're kinda hard to find, not only because of low numbers but also because of how the media+policing apparatus operates. If somebody is a watered down populist, they may be able to get famous and remain that way, and all is good. But if they are a principled marxist-leninist, they will tend to face media blackout, or slander and violent repression if they can't be ignored. I mean, Bernie Sanders is a milquetoast soc dem and they still did a mix of media blackout and hit pieces on him when he was trying to run for president.