It's not terribly interesting. There have always been two strains of thought for the Democrats in the US. Once has been that we must move the whole country in the right direction kicking and screaming - this has been the ideology that has been in ascendency since Kennedy. The other that we must be allowed to be as progressive as possible without interference from the Federal government. That's not been in vouge since the end of the new deal.
I'm completely in the second camp and would move back to the US if it were possible to get it adopted at the national level.