"Progressive" predates "liberal" as a term. It's back.
"Progressive" conjures up images of forward progress, industrious people making advances, building things, bettering the world with technology... Progress!
Funny how twisted words are. I don't see the philosophy of "Progressives" being progress in any sense of the word. Well, maybe in a strictly temporal sense (As entropy marches on, all truly free societies decay into socialism due to the inherent flaw in how power is distributed - half the country will vote to enslave the other half.)
As a result, about the only way I want the word "Progressive" being associated with me is in the phrase "progressive loading press" or "progressive stamping die".