if Trump were elected as a Democrat in 2016 who would his VP have been

[Beefalow and the Consumer]

In order for this to happen in the first place Donald Trump would have needed to create a very different persona than the one he has now, starting back in 2009. No involvement in birtherism,  support for gun control and universal health care as a main issues instead of immigration restrictions etc.

If he had done this, Bernie might just as well have become his VP.

Totally agree, up until Bernie Sanders. If we're gonna parallel 2016, Trump will pick someone who

1. Has strong executive credibility and experience
2. Is willing to toe the line and defend Trump
3. Has political ambitions of his own
4. Has strong progressive credentials

There's no one who really fits the bill. Andrew Cuomo would have been a good choice if Trump weren't from New York.

[Beefalow and the Consumer]

How would he be elected as a Democrat when he's so far to the right?

Like what if Bernie Sanders was a Republican, would he be running for President? Gosh, I don't, we'd be talking about a totally different person.

https://www.nbcnews.com/think/opinion/when-trump-ran-against-trump-ism-story-2000-election-ncna915651

You could envision Trump morphing into a left-populist demagogue. He would have had to "come to a new understanding" about race relations, but he's a chameleon. He could just become a regular on Oprah.