Latino voters hold the keys to Democratic victories in the swing states of Arizona and Nevada, Harold Meyerson argues. New polling data highlights the possibilities - and the problems.plus: Joe Biden has just made marijuana legalization a campaign issue–the Democrats should run with it, says John Nichols.Also: Greil Marcus talks about Bob Dylan, from “Blowin’ in the Wind” in 1962 to “Murder Most Foul” in 2020. Greil has a new book out, it’s called “Folk Music: A Bob Dylan Biography in 7 Songs.”