I think they have tried but they get their teeth kicked in on campuses by the leaders of the schools, student unions, etc by trying to ban them, protesting them, giving them little or no space for outreach, voter registration, prereg etc.
Democrats definitely have the massive numbers of volunteers to do outreach and go neighborhood to neighborhood getting new voters. They go into the hoods, the ghettos, where Repubs and Conservatives are unable to go do to the generational dem voting brain washing for the last 50 years.
The left in America is the biggest threat to the Republic and the right has very little to counter it with. We are more civil, honest, and true to ourselves. Every great attribute we have as Conservatives upholding the Constitution is leveraged against us by the left. The left easily brainwashes imbeciles of all ages. The Trump win was either a miracle or turning point. The greatest power that we have is the 2nd Amendment and the left knows it. They take that, it’s lights out.