The fact that Washington DC is an incestuous swamp is well known and anyone who thinks or thought that cleaning that up was going to be easy or quick is SADLY mistaken!
The President alone cannot do as much as some think. That became clear during Reagan's administration.
Many of those a President would need help from, are themselves part of the entrenched, self-interested DC Swamp.
The same interests that now resist Trump draining the Swamp, would be equally resistant to a Cruz, Paul, Walker, Kasich draining the same Swamp.
Anybody thinking otherwise is delusional.