With 23 debates held thus far, the GOP candidates have conjured a great deal of applause, cheers, boos and laughter. But whether or not audience reactions are allowed is largely dependent on the commentator and arena: Brian Williams instructed the audience of this Monday's debate broadcast on NBC to refrain from clapping or any verbal reactions. On Tuesday, Newt Gingrich told "Fox & Friends" host Gretchen Carlson that he disagrees with silencing debate audiences, and threatened not to participate in future debates that prohibit reactions.