Roger MacDonald, Director the Internet Archive's Television News Archive, created this fantastic visualization of what percent of the subsequent rebroadcasts of soundbites from the first republican presidential debate on each major television network were by each candidate.

FOX News actually was quite balanced in the amount of time it accorded to soundbites from each candidates, while MSNBC and CNN were the most imbalanced in favor of Trump.  Univision focused heavily on Trump and Rubio.  Al Jazeera America was the only station not to prioritize soundbites from Trump, favoring instead Rand Paul's comments about the Fourth Amendment and mass surveillance.  You can drill down yourself using our two interactive visualizations.