Officially, the summit for democratic socialists across the country here this weekend was taking place in a hotel conference facility. But on Friday night, the real action was at a corner bar two miles away, where dozens of members of the Democratic Socialists of America crammed into a patio in the middle of a summer storm. As the rain poured down, two DSA leaders put it bluntly: If they wanted Rep. Alexandria Ocasio-Cortez (D) to run for president — and if they wanted the DSA to endorse her — it was time to start now. “We’re in the moment of...