I am beginning to think that the "infighting" is by design. Look at the viewership numbers! This last debate was the 3rd most watched national primary debate EVER (estimated at 21 million viewers). 2nd and 1st most watched were in August and September of this year with 25 and 24 million, respectively. That basically means that there have never been so many people interested in the Republican primary debates. Not even close! 4 years ago, the most watched GOP primary debate had less than 7 million viewers.
There is a fine line between damaging your own reputation/arguments and making it interesting/entertaining enough for sheep to watch.
Maybe I'm being naive and optimistic by thinking that this is intentional, but you cannot deny that it's working:
-Obama is more unpopular than ever (43% approval yesterday)
-Sanders is quickly deflating
-HRC is a traitor and should be in jail (any of us would be for doing HALF the things she's done...) and she won't stand up to real scrutiny
-Nobody even knows the names of any other Dem presidential candidates
-Dems latest debate had a very weak 8.5 Million viewers in comparison
-Every month sets a new record for gun sales (most notably, first time purchasers)