I think you got it backwards. It's the Sanders voters who flipped for Trump (yes they exist), not Trump voters who might have reluctantly settled for Sanders, though that too. Sanders had the better economic message. Clinton not only didn't have a message, it wouldn't have been heard if she did due to people's irrational feelings against her. Lots of people despised Trump but voted for him anyway. Trump by far has the worse character issues - sexual predator, bankruptcies, life of luxury while stiffing workers, anti-veteran, sexual predator, did I mention sexual predator? Actually, if Sanders once chanted "die Yankee" it might have picked him up a southern state or two.