Robert Siegel talks to Lowell Bergman about a ProPublica investigation into billionaire and Republican political contributor Sheldon Adelson. There are concerns that Adelson may have violated the Foreign Corrupt Practices Act in his payments to a Macau lawyer who represented his firm's interests in the booming gambling capital. Bergman co-reported the story with Stephen Engelberg and Matt Isaacs for the Investigative Reporting Program of the University of California at Berkeley and PBS Frontline.