The importance of the new Presidential debate mic cutoff

A five-minute video with the brief remark below it:

"Being able to turn off the mic is a really powerful tool," says John Donvan, Debate Moderator-In-Chief for the group Open To Debate. "Interruptions tend to be not in good faith....given the choice between losing atmospheric buzz and keeping the substance on track...I vote for keeping the substance on track."

John Donvan is a familiar voice to Americans who listen to public radio and television news.