Attorney General Sessions is Democrats' worst nightmare

President-elect Trump’s transition team knew that nominating Jeff Sessions for Attorney General would set off controversy. Democrats and their allies in the press have at key times in the past called Sessions a racist — they’re now using the Alabama senator’s full name, Jefferson Beauregard Sessions III, to heighten the Old South effect — and now, as they oppose Trump at nearly every turn, they’ve turned to race again.

Here’s why the effort to stop Sessions is likely to intensify as his confirmation hearings near. Sessions is the Senate’s highest-profile, most determined, and most knowledgeabl...