You just never saw it because nobody has ever had a reason to attack him. Hillary couldn't risk offending the millennials.

For Trump the strategic situation is entirely different. Everyone in America would have known about the creepy shit Bernie wrote in the seventies, and that would be just the beginning.

And besides, as we've already learned from the Clinton campaign, and as we clearly saw in both Obama runs, the "scandals" around Democrats don't need to have any basis in reality anyway. It's all about narrative and perception. And whatever you might think, it's much easier to paint a negative narrative about a granola socialist from Vermont than a popular Secretary of State (yes, she was historically popular until the Republicans turned their guns against her).