While Hillary Clinton and Donald Trump each generated headlines about comments made Wednesday night at a candidates’ forum, the buzz Thursday morning was more about a report claiming Clinton relied on a “micro” earbud as she fielded questions about national security — a claim her campaign vigorously denied. The website True Pundit quoted unnamed New York police sources saying Clinton was wearing an “inductive earpiece” during the NBC forum hosted by Matt Lauer. The website described the unit as the kind of tech used by stage actors in need of prompting to recite forgotten lines. Two senior campaign aides, though,...