United States Assistant Attorney General Thomas Perez, left, who heads up the civil rights division at the Department of Justice, is joined by Deputy Assistant Attorney General for Civil Rights, Roy Austin, as Perez announces a federal civil lawsuit against Maricopa County Sheriff Joe Arpaio during a news conference Thursday, May 10, 2012, in Phoenix.  The move came after months of negotiations failed to yield an agreement to settle allegations that his department racially profiled Latinos in his trademark immigration patrols.  (AP Photo/Ross D. Franklin)