Bernie Sanders’ 2020 presidential campaign launched like a rocket. Within 24 hours of his official kickoff, the Vermont senator had raised a staggering $6 million, quadruple the previous known first-day record, and within a week, his campaign had signed up more than 1 million volunteers. All that excitement is already showing up in the polls, where Sanders had been running second in a still-hypothetical field for most of the past year.