Reporting from Phoenix - The day after the federal government told Maricopa County Sheriff Joe Arpaio that he could no longer use his deputies to round up suspected illegal immigrants on the street, the combative Arizona sheriff did just that. He launched one of his notorious "sweeps," in which his officers descend on heavily Latino neighborhoods, arrest hundreds of people for violations as minor as a busted headlight and ask them whether they are in the country legally. "I wanted to show everybody it didn't make a difference," Arpaio said of the Obama administration's order. Arpaio calls himself "America's toughest...