From a Washington Post op-ed Hector Aguilar Camín, editor the Mexican magazine Nexos, and Jorge G. Castaneda, a former Mexican foreign minister and now a lecturer at NYU:

On Nov. 2, Californians will vote on Proposition 19, deciding whether to legalize the production, sale and consumption of marijuana. If the initiative passes, it won’t just be momentous for California; it may, at long last, offer Mexico the promise of an exit from our costly war on drugs.

The costs of that war have long since reached intolerable levels: more than 28,000 of our fellow citizens dead since late 2006; expenditures well above $10 billion; terrible damage to Mexico’s image abroad; human rights violations by government security forces; and ever more crime. In a recent poll by the Mexico City daily Reforma, 67 percent of Mexicans said these costs are unacceptable, while 59 percent said the drug cartels are winning the war…

Proposition 19 changes this calculation. For Mexico, California is almost the whole enchilada: Our overall trade with the largest state of the union is huge, an immense number of Californians are of Mexican origin, and an enormous proportion of American visitors to Mexico come from California. Passage of Prop 19 would therefore flip the terms of the debate about drug policy: If California legalizes marijuana, will it be viable for our country to continue hunting down drug lords in Tijuana? Will Wild West-style shootouts to stop Mexican cannabis from crossing the border make any sense when, just over that border, the local 7-Eleven sells pot?