From the 'Well duh!' department ... yes Sanders would've beaten Trump.

Easily, I might add -

http://www.huffingtonpost.com/entry/2016-election-poll-bernie-sanders-trump_us_58260f7ee4b0c4b63b0c6928

"The national survey of more than 1,600 registered voters, conducted by Gravis Marketing two days before the general election, found that Sanders would have received 56 percent of the vote while Trump would have won 44 percent. The poll was commissioned and financed by outgoing Florida Congressman Alan Grayson, a Democrat who endorsed Sanders in the presidential primary."