Bernie Sanders keeps refusing to hit Hillary Clinton over her email. Or so it seems. But maybe the Vermont senator’s relentless assault on Mrs. Clinton’s corporate ties is about her email after all. Maybe Mr. Sanders is betting that Hillary has a bigger problem than classified information.

The question hanging over the Clinton campaign is whether she will be indicted for mishandling state secrets. Under the heroic grilling of Jorge Ramos at the Univision Democratic debate Wednesday, Mrs. Clinton was again forced to roll...