The Democratic National Committee passed new rules Saturday that will sideline superdelegates in the presidential selection process — a radical shift that was pushed by the party’s left-leaning Bernie Sanders wing. The change will sharply reduce the power of party insiders in the 2020 primaries. Coming ahead of November’s crucial midterms, the move also signals the Democrats’ increasing reliance on young progressive voters who they hope will turn out in unprecedented numbers this fall. **SNIP** In 2016, Hillary Clinton used that history to her advantage. As the party establishment’s favorite, she locked up the support of a majority of the...