Every Friday, The Takeaway convenes a panel to look back at the week’s big stories. This week, we’ll hear more about Arizona v. U.S., the case that will determine the constitutionality of Arizona’s immigration law, known as SB 1070. James and Rupert Murdoch both testified before a British inquiry into media ethics, our partner The New York Times published a comprehensive investigation into Walmart’s practices in Mexico, and the campaign finance case against former Senator John Edwards began in North Carolina. Farai Chideya, journalist and Fellow at Harvard University’s Institute of Politics, and Paddy O’Connell, host of the BBC’s Broadcasting House program, explain the news of the week.