The democrats saw the terrorist mass murder raising a losing issue - mass unrestrained legal and illegal immigration - so the democrats turned it into yet another gun control debate. The republicans mangled their response, as usual, and Trump did a bad job on the side discussion about guns. Fortunately, Trump is still right on immigration.
The career politicians KNOW the end is near: A complete political outsider who has run a completely un-conventional campaign who lacks even the basic sense of Political Correctness being elected President would change the game forever.