By any other name...
"progressive" is just the latest in a long line of different names for the same collectivist philosophies. The movement changes its name as often as someone who writes bad checks for a living, and for similar reasons.
When the people catch on to what "progressives" really stand for, I'm sure they'll think of another name.
Goldwater, in the examples you used, had yet to have his guts kicked out by Johnson's campaign.