If you have ever been curious about the families of those rural Mexicans who go to work illegally in the U.S., and what sacrifices they make to send money back their families -- and what life is like for those family members, principally old and young, who stay behind -- an outstanding film on this very theme opens this Friday in Mexico City. Winner of the Target Documentary prize at the Los Angeles Film Festival, Los que se quedan (Those Who Stay) tries to avoid politicizing or stereotyping the situation, instead opting to let the villagers tell the stories of their lives. It is the best documentary I have seen in a long time and I hope it gets distribution in the U.S. It should be required viewing for any politician or pundit on either side of the border who participates in the immigration debate.