
The republican debate on Fox Business news was drastically different from the first three debates. This debate featured very little trash talking, although there was some, and much more substantive debate, although not without candidates taking shots at each other. Governor Kasich took shots at some candidates for their economic policies, and Donald Trump fired back with a patented humble-brag insult directed towards Kasich, but overall there was very little fireworks compared to the first three debates (Link).
The change in this debate is due to a couple factors. The third republican debate, hosted by CNBC, was widely considered a train wreck. The moderators seemed more interested in setting up confrontations between the candidates and less interested in substance. Chris Christie had a moment where he openly bashed the moderators for being rude, and received praise for it (Link). As a result of the CNBC debate, the candidates, who previously had no objections to the moderators provoking conflict, began to take on an anti-media frame.
A very popular opinion among republican voters is that the national media has a liberal bias, and Ted Cruz and Marco Rubio took a stand against the liberal media, saying "This is not a cage match" (Link). This anti-mass-media, anti-liberal media bias is a very popular frame amongst republican candidates. Even further, it was the perfect response to the absurd moderating style that had been used in all three debates, but boiled over the top in the CNBC debate.
Not only did the CNBC debate provide the opportunity for a candidate to publicize the widely supported anti-liberal frame, but it also allowed the candidates as a group to appear as sophisticated, above the nonsense, and presidential, which benefitted each candidate. It even allowed them to take a stand collectively, regain some bargaining power in terms of how the debates will be run in the future (Link).
All of this reaction stemming from the debacle that was the CNBC debate was in stark contrast to the reaction, or lack thereof, from the same style of moderating highlighted a change in the way that the republican debates will be run from now on. In the first two debates, it almost seemed like the candidates welcomed the verbal combat prompted by moderators, seemingly planning attacks out ahead of time in certain cases. But after the backlash CNBC and their moderators got, combined with the momentum the republican candidates received, look for the debates to be much more substantive from now on.

