I mean straight up we shouldn't have nominated someone who's only a little more popular than him then.
So, in the race between Bernie and Hillary, Hillary won. Who is the "we" you refer to? The primary/caucus voters? The ones who preferred and voted for Hillary?
People need to stop with the narrative that "we" could've prevented this. The Hillary campaign made mistakes, but Trump won it, partially by pushing the GOP narrative harder than even Chaffetz did on emails, and partially by playing to the very worst of humanity.