Sanders' upbringing in a struggling working-class family in a hardscrabble section of Brooklyn during the 1950s taught him that poverty is a disease, one that affects us all. Incredibly, the lessons he learned back then are revolutionizing the political process this year, marking the resurgence of political progressivism on the left at the same time as the two-party system seems to be on the way out. From McGovern's 1972 loss to Nixon to the Occupy...