I meant someone you know personally.
I know quite a few, including myself and several members of my family. It's extremely common. Since Leftist political philosophy relies upon a flawed and incomplete understanding of human nature and economics, but an understanding that has a certain appeal to those with little life or financial experience along with an inclination to rebel just for the hell of it, college kids are perfectly suited to fall for it. I would estimate that the majority of trendy Leftist kids on campus abandon those views, or certainly the hardcore ideology from which they spring, within five years after they graduate.
It's only the small minority, usually those who intend to remain in the cloistered halls of academe for their entire careers, who bury themselves so deeply in Leftist text that they remained chained to it into mature adulthood. Good examples of the species are guys like Michael Hardt and Antonio Negri, authors of the leftwing sensation Empire, a book that is all abstract jargon and obscure neologisms, except when it is childish drivel with no connection to the real world.
Coming from a Democrat family, I was a "Cold War Liberal" back in the 60's supporting JFK and Martin Luther King but strongly anti-communist. But, of course, if Kennedy was around now saying the same stuff they'd call him a right-wing extremist like I have been called (and worse) since about 1970. And, of course, King's version or equality has been out of style since about '65 and even King himself started going the PC - "affirmative" action route towards the end.