This here is an important point that can’t be brought up enough.
Ever wonder why no interesting center-left Democrats aren’t challenging an increasingly vulnerable Hillary Clinton? There aren’t any. Nobody. No one.
As Britain and France were bled white by their World War I battles, the Democrats were drained by a series of midterm debacles in which those in swing states were punished by voters, and all but the bluest of blue were cut down. On the altar of healthcare, Democrats sacrificed the fruit of two cycles of party-expansion, the picking of people who could win in red states and red districts, to bolster the party’s breadth and appeal.