The drumbeat for Democratic National Committee boss Tom Perez to be “held accountable” for recent party failures appears to be getting louder. The latest Democrats to criticize Perez include U.S. Reps. Alexandria Ocasio-Cortez, D-N.Y.; Ilhan Omar, D-Minn.; and Pramila Jayapal, D-Wash., all backers of 2020 presidential candidate Sen. Bernie Sanders, I-Vt. Recent party setbacks have included the vote-count fiasco at Monday’s Iowa caucuses and Tuesday night’s disclosure that two officials on the host committee of the party’s upcoming national convention in Milwaukee had been fired over non-specified allegations that they oversaw a work environment where staff members were not being...