When immigration laws become unbearably tight for them, do undocumented immigrants really "self-deport," in the parlance of GOP presidential candidate Mitt Romney?
Advocates of what's referred to as attrition by enforcement have long argued that it works, although there's still no hard data that undocumented immigrants have left in large numbers. A new report from the Center for American Progress, a liberal policy think tank in Washington, D.C., uses data that includes a UC San Diego study of immigrants in Oklahoma City, where state anti-illegal immigration legislation was enacted well ahead of Arizona's SB 1070. It concludes that rather than leave the country, those who move as a result of strict immigration laws - as many have done from Alabama, for example - only move to another county or state. From the report: