Oh, he's evolved alright--on universal healthcare, taxation, gun control, abortion, Iran's nuclear ambitions, Obama, Hillary, Nancy Pelosi, property rights, immigration... I just get the distinct impression that he's shallow, insincere, and unprincipled, except when it comes to self-promotion. By nature, he's really an establishment progressive who's putting out this populist narrative because that's what will resonate most with the public. He's selling a brand, like Coke or Häagen-Dazs. Glenn Beck had him pegged perfectly. I'm a conservative and would never vote for Bernie, but at least I sense that he actually believes in something.
https://www.youtube.com/watch?v=yf5UV7bo8_M