No, but his polling that was better than Clinton in red state supports the belief that he would have won.

Also, it was rigged, Bernie sued the DNC arguing that it was. The DNC pretty much admitted it as their defence:

“…the DNC and Wasserman Schultz have characterized the DNC charter’s promise of ‘impartiality and evenhandedness’ as a mere political promise—political rhetoric that is not enforceable in federal courts.”