Both parties’ presidential front-runners are growing increasingly unpopular, a new Wall Street Journal/NBC News poll finds, with Hillary Clinton showing an especially steep decline over the past month.

Among voters in both parties, 56% hold a negative view of Mrs. Clinton and 32% hold a positive view. That 24-point gap is almost twice as wide as in a Journal/NBC poll last month, when 51% viewed her negatively and 38% positively, a 13-point gap.

...