A quote from a Politico article about Democrats' difficulties that I really like It's not behind their paywall so check it out.
“We’re failing across the board because fundamentally the Democratic Party is a machine that is built by a bunch of Ivy League grads to talk to a bunch of Ivy League grads,” said a Democratic consultant to whom I granted anonymity “because I don’t know how to say this in a way that won’t ruin my career.”
The delicious irony is that many Democrats recognize this fatal error but cannot imagine an electoral way to change it that doesn't involve seppuku.