Trump is winning for completely different reasons than Sanders is. Scott Adams, the artist who does Dilbert, predicted back in
August that Trump would not only dominate the polls and win the nomination, he would go on to completely roll over anyone the Democrats nominate. And since then he has made many other predictions based upon his same perspectives, that he calls the "Master Persuader Filter" way of looking at politics. I've been following his blog for years, and have been following his Trump predictions the entire time, and therefore am a witness that he has predicted at least 9 notable events along the way with surprising detail and precision. It is well worth your time, if you want to see a talented political prognosticator who is not afraid to show his work.
http://blog.dilbert.com/Love him or hate him, Trump will win.