Moderator Lester Holt under scrutiny during debate

Everyone’s aware of the stakes for Hillary Clinton and Donald Trump during the first presidential debate, but there’s a third person in the equation who faces a different pressure: Lester Holt. The NBC News veteran is moderating his first general election debate, making him solely responsible for the questions asked each candidate and for steering the conversation. His performance will be closely watched, particularly in light of a dispute over the extent to which he should call politicians out for…