How immigrants are redefining 'American' in Southern California

Romney's 'self-deportation' is not a new concept - does it work?

Republican presidential candidate Mitt Romney's line during last night's debate in Florida about "self-deportation" has drawn its share of attention (and cracks) by now, but the concept he's talking about isn't a novel one. Though whether it really works as intended is another question.

Questioned about what he'd do with undocumented immigrants if he doesn't plan to round them up and deport them, Romney talked about making it impossible for them to get jobs, referencing the federal E-Verify status-check tool used by some employers (and which some states have made mandatory). The idea would be to make life so difficult for undocumented immigrants that they would leave of their own volition, a concept known as "attrition through enforcement," which advocates of tighter immigration restrictions have supported for years.