The survey comes more than four years after the Supreme Court effectively legalized commercial sports betting in the United States. adults (19%) say they have personally bet money on sports in some way in the last 12 months, whether with friends or family, in person at a casino or other gambling venue, or online with a betting app, according to a new Pew Research Center survey. (Mark Makela/Getty Images)Īround one-in-five U.S. A man reviews a betting guide after placing a wager at the Harrington Raceway and Casino in Harrington, Delaware.