3.2 beer in Colorado is a hangover from the grand old days. Back then (when Hector was a pup and every key chain bore a church key), 18 year olds could purchase and consume 3.2 and nothing, beer, wine or spirits, stronger. I seem to recall that as late as the early 60s, Virginia had similar beverage laws.
Much of West Texas was "Bone Dry", and many college age travelers returning by car from the scenic and well-lubricated mountains drove back to the High and Dry Plains with a trunk load of 3.2 Coors, glugged down by fellow teens who were able to drink much more of it without becoming comatose than of 5% Pearl and Lone Star hauled uphill from wet counties to the South and East.
Revisionist and revanchist historians may opine that the early popularity of Coors (when it was finally distributed in Texas) were those cultural memories of being able to guzzle a couple of 6 packs of the old 3.2 Coors "Banquet Beer" without needing your date to drive you home from the weekend beer bust held in the lights of dusty pickup trucks parked around some muddy stock pond.
Ahhh, the halcyon days of my youth!