How Sports Betting Hit the Mainstream in America

This weekend, one of the most watched sporting events of the year, the Super Bowl, will draw an estimated $16 billion in bets from Americans, more than double last year’s total. The booming trade is a sign of how gambling has gone from illegal to legal very quickly in many states — and hints at the enormous risks posed by the change. Guest: Kenneth P. Vogel, an investigative correspondent for The New York Times.