First: Mitch McConnell is a dink. Or, as wisely pointed out to me: “ a product of not age, but poorly formed character.”
As for 2016: there are a lot of ways to slice the data, any one of which could have made the difference. I’d rather blame people who look like me for getting sucked into the false “both parties are the same!” nonsense than young people. Also, as it turns out so-called environmentalists, across all demographics, are worse at turning out to vote than people who don’t self-identify as such!