She, Herself said it: "all that red in the middle."
PA18 proves her point, that people, properly "woke" to the, umm, features, of a Trump presidency, will turn out for the right Democrat. Hence, since Trump's election, safe seats (even GA6, where I reside) have become closely contested races. And Dems might have, by the time you read this, taken their first blood in a Congressional election year.
They'll proclaim it the beginning of the "wave." But reality doesn't change what Hillary said, despicable as those remarks are.
Red doesn't magically become blue.
The issues important to people who live in "all that red in the middle" are still important. Even in blue, states, there's plenty of people who care about the Second Amendment, plenty of people who support a baby's right to be born as a full person in the womb.
As Erick Erickson observed, "If Democrats are smart enough to run non-Pelosi types in red districts, that will exacerbate the GOP wipeout." That portends a civil war in the Democratic universe.
It means Democrats will have to choose between litmus tests on "intersectional" issues, especially extreme gun bans, social progressive issues-of-the-day, anti-faith, and abortion--and winning "red" seats.
It's not about "red" and "blue." Voters will support whoever best represents their concerns. Hillary hit the issue head on. "All that red" is not going away. If the Democrats want to keep their tent small, filled with insane clowns and race baiters, that's fine with me. But winning tends to be a motivator for change.
They're going to need a bigger tent.