A resurgent American left is heading into November's midterm elections hoping not merely to help Democrats recapture Congress, but to reshape the party that takes power.
The temptation exists to compare the successes of the most left-wing candidates to the Democratic primaries for the November 3 election with those of the Tea Party Conservatives who had drawn the Republican Party to the right after the election of Barack Obama in 2008. But the mirror effect is in part misleading: the left-wing slingers are of varying obedience, the American Democratic Socialists (DSA), the formation of the mayor of New York Zohr…