Sheldon Adelson, the chief executive of the Las Vegas Sands Corp., has amassed an estimated $25 billion fortune. Formerly a donor to Newt Gingrich's failed presidential bid, he now donates large sums of money to a super PAC supporting Mitt Romney. But his business is under federal investigation for alleged bribery of Chinese officials.
Top GOP Donor Under Scrutiny
Lowell Bergman, producer/correspondent for the PBS series "Frontline" and professor of investigative reporting at the UC Berkeley Graduate School of Journalism
Matt Isaacs, senior reporter and instructor at the UC Berkeley Investigative Reporting Program