While Trump is not my first, or even 4th choice, I’ve got two words to say to those who dismiss him out of hand: Jesse Ventura! Both parties were blindsided. Sometimes to hear a non-politician speak his mind is more refreshing than the “professionals” think!
For that matter Barack Obama. Two years as an inactive Senator is not a resume. He was an outsider, community organizer, that inspired supporters. Same for Arnold Schwarzenegger.
This track record should scare people away.