text: Excellent segment by Chuck Todd this am.  He had about 6 -8 questions from still strong Trump supporters that helps answer your question.  He thinks a third party has been formed in voters. He says that is not mainstream republican or Democrat.  My take on the polls in 2016 didnt design this voting block into their surveys.  Asked the same old types of questions but failed to see where these votes were going to be cast. The design was flawed.  Me thinks they got lazy.  Todd speculates the reports of waning trump support is also false.  Fascinating list of about 8 questions showing how this third group is not going away.  I wish I could remember them, but one showed a huge swing in evangelicals accepting Trump's behavior where in 2008 they would have been far less accepting and forgiving.  It was like 22% then and like 77% now.  Check out Meet the Press this am.  I couldnt find the survey link.  FASCINATING.  I think they'll get it wrong again.