It's the moment for which advocates of legal marijuana here have been waiting: Mexican lawmakers, working under a court order, have until mid-December to finalize rules that will make the country the world's largest market for legal pot. Advocates have long argued that legalization would put a dent in the black market; allow for safe, regulated consumption; create jobs; and cut down on crime. But rather than counting down the days with glee, they’re waging an 11th-hour campaign to change legislation that they say would favor large corporations over small businesses and family-owned farms, while doing little to address the issues at the root of the country’s illegal drug trade.