After marijuana, are magic mushrooms next to be decriminalised in California?
theguardian.com
theguardian.com
That being said, safe, controlled use is especially important for powerfully psychoactive substances. Make no mistake--psilocybin is much more powerful than THC. While I support use of psilocybin and the aim of the petition and its authors, I recognize the essential role that medical marijuana played in winning hearts and minds of John Q. Public.
If you feel the same way, check out the work done by the Heffter Research Institute (http://heffter.org/) They've funded many studies on the effectiveness of psilocybin (disclosure: I know the founder).
Make it seem to the public that it's a normal thing, everyone is doing it. Once a large enough portion of the voting population see it as no big deal, they're more likely to say "why not?" at the polls, even if they don't have any interest in partaking.
It takes several years, but it has proven effective.