Proponents of a petition legalizing small amounts of marijuana launched their campaign Tuesday, recruiting volunteers, serving snacks and urging Nevada voters to support a "tax-and-regulate" proposal on the November ballot. "Our marijuana laws don't work," said Neal Levine, executive director of the Committee to Regulate and Control Marijuana. The group is largely funded by the Washington D.C.-based Marijuana Policy Project. This is the latest in a string of legalization efforts backed by the group. In 2002, Nevada voters overwhelmingly rejected a petition that would have legalized up to 3 ounces of marijuana. A similar petition failed to qualify for the...