A more relevant question would be if the Democrats have moved so far left how come Sanders didn’t wipe the floor with Clinton in ‘16? I challenge you to find an Obama quote where he “vehemently” opposes big systemic change as a Democratic platform plank. Obama’s statement to the donors was measured and most likely accurate, there is still only a minority of voters calling for dramatic systemic change. He could be wrong, I might be wrong, if so we will see Bernie wiping the floor through the primaries and right into the general. That’s why we hold elections, to see what the voters are actually thinking, if anything. Too often they are reacting to the first 4/10 of a second that they see of a candidate on TV.