The country is polarized. That's all those numbers show. When partisans know their enemy, they hate them.

Before the 2012 election, when Barack Obama was running for office and Hillary wasn't, his approval was in the 40s and hers was in the upper sixties.

If Bernie Sanders was running for anything, and the GOP had just spent the last week and the last year insinuating about his past (instead of talking him up, as they have been doing), he would not look popular right now, and he'd definitely not look like a unifier.