A Zogby poll found that over half of American's favor the legalization of pot:
Voters were asked: "Scarce law enforcement and prison resources, a desire to neutralize drug cartels and the need for new sources of revenue have resurrected the topic of legalizing marijuana. Proponents say it makes sense to tax and regulate the drug while opponents say that legalization would lead marijuana users to use other illegal drugs. Would you favor or oppose the government's effort to legalize marijuana?"
Zogby Poll: Majority support legalization (Thanks Jonathan!)