1. Republicans really struggle to talk to anyone but their own base of aging white conservatives and plutocrats. Hillary able to call him out directly and totally outclass him, leaving him utterly unable to respond, is something that he will be more prepared for in the future, but also shows just how many terrible things all these clowns running for the Republican nomination have done and the difficulty of walking back that record to appeal to broad electorate.
2. Bernie Sanders is very bad at talking to people who are not white liberals. I thought he was a skilled enough politician to show the needed dexterity to talk to a variety of people in their own spaces that would combine his own particular focus on income inequality with other issues that mattered to his audience. It’s becoming clear that he’s really not that good of a politician.