Trump is a known quantity. Has been in public sphere for decades, and everyone knows he's a jackhole. GOP, conservatives and opposition groups/pacs haven't started aiming their artillery on Bernie. Once they do, all the bullshit about raising taxes and praising Castro will bubble to the top. The barrage will be relentless. Bernie will be on the defense every single day to the election answering and explaining his remarks, and in American politics, as they say, "if you're explaining, you're losing".