Supreme Court takes up 'show me your papers' immigration law

Former Arizona state Sen. Russell Pearce, the architect of Arizona's controversial immigration law S.B. 1070, left, accompanied by former Arizona Sen. Dennis DeConcini, testifies on Capitol Hill in Washington, Tuesday, April 24, 2012, before the Senate Immigration, Refugees and Border Security subcommittee hearing entitled "Examining the Constitutionality and Prudence of State and Local Governments Enforcing Immigration Law." The Supreme Court will referee another major clash between the Obama administration and the states Wednesday as it hears arguments over Arizona's crackdown on illegal immigrants. (AP Photo/J. Scott Applewhite)