“Except large numbers of Trump supporters proudly proclaim they they will not vote for down-ticket Republicans, so the GOP will likely be weaker in Congress.”
This is pure bovine droppings. There is NO EVIDENCE to support such a claim. GOP down ballot will do quite well on Nov 8th when Trump is elected President.
Vote Trump 2016
So this is shaping up to be a somewhat traditional election after all?
The GOP delegates, despite warnings and rantings, fell in line to support the primary pick after all, and gradually former rivals and other GOP candidates have fallen into line, and the feeling is that disgruntled conservatives who scorned the GOP Establishment will fall into line and vote for down-ticket Republicans after all. May God grant!