Don't see the argument that Sanders isn't a stronger general election candidate. All it comes down to is he won't survive the Republican attack machine. If he's so fragile, why has he survived Hillary's attack machine? She has made the case he's unelectable and aggressively gone after him yet he still boasts higher favorables and better general election numbers.
He hasn't survived Hillary's attack machine and Hillary has pretty much run a fraction (about 1/10th) of the attacks she ran on Obama 8 years ago. No way would Bernie survive a GOP sliming