I think it's safe to say the majority of hedonists are Democrats. The vote was 55-45, with counties that are heavily "progressive" having more lopsided votes for legalization, suggesting it was Democrats that mostly voted yes.
These days many Republicans have abandoned their traditional moral postures and embraced nihilistic libertinism, so I'm sure there were plenty of Republicans that thought "why not?"
http://data.denverpost.com/election/results/amendment/2012/64-legalize-marijuana/
It wasn’t “nihilistic libertarianism” that was the reason for all manner of medications being available at the neighborhood drugstore for the asking, in the late 1800s.
Marijuana was never prohibited at any time in history until the Progressives Era. The claim that mj prohibition is a traditional moral posture is nonsense.