Sounds like he's the anti-Obama. Obama got a lot of Republicans, including William F. Buckley's dingbat son, to support him, and a lot of others to say nice things about him, even though it was documented that he was a marxist with extreme anti-American views, and had never actually done anything in his entire life. People projected things into him that weren't there. If Trump can tap into a dissatisfaction that many on the left feel towards the mainstream of their party, and gets them to vote his way on an anti-establishment wave, so be it. I think he can get a lot of blacks, hispanics and blue collar whites to vote Republican for the first time since Reagan. People like him.
So, I don't view it as a negative that a Sanders voter might vote for Trump. It's not Trump's fault that the guy is confused.