Gay marriage provides equal benifits and rights to everyone while harming nobody. By that merit alone, it's not even something that should be put to vote, it should just automatically be legal.
Pot is less harmful than either alcohol or tobacco, and the only significant downsides to it would be solved by legalizing it - would remove a lot of street crime, free up police time, provide a new source of taxation, and allow it to be regulated.
The same goes for Prostitution. The only reason it's illegal is because it's a dangerous profession, and the only reason it's dangerous is because it's illegal - if it was legalized, it could be regulated and taxed, new jobs could be formed, it could be a much healthier profession, and would free up much needed police power.
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Joyrock
Fresh from my first justified ban. Ever!