Donald Trump has spoken out against the Iraq war since before it was cool. He's also spoken out about the "too big to fail" banksters, and even force a pledge to the GOP platform to break up the six largest banks and bring back the Glass Steagall act that prohibited banks from gambling on high risk investments. 

There's the Donald Trump portrayed by the corporatist media in the pocket of the Democrat establishment machine. Then there's the real Donald Trump. Bernie supporters could do worse than sending a message to the corrupt Clinton/Schultz/Obama troika by denying them the accession to the throne they think they're entitled to.