Many college students of today are the influential leaders of tomorrow. What young people (especially) see, hear and listen to mold their beliefs and their world view, which influences their actions and their choices.
And regarding Marxism, you don't think Marxist crap influenced the current crop of liberals? The leftist ideology taught in institutions of higher learning [sic] across the land has influenced and will continue to influence countless numbers of students. Where do you think the Clintons got their ideas? They were just born with them? Or they were influenced by their college professors?