A long article from The New Yorker tells it all.
Moreover, for many people, including some who slept through high-school civics, the past several weeks have been a kind of adult-education seminar in American government. Whatever else it will change, in other words, this surge of grass-roots activism is already changing the people who participate in it. And that change can bring about others: today’s newly engaged citizen might be 2018’s motivated midterm voter, or 2020’s brand-new city council member, or the dark-horse victor in a Senate race in 2024.