LAS VEGAS — Oddsmakers like the chances of Tom Brady winning a sixth Super Bowl ring, making the New England Patriots nearly a touchdown favorite to beat the Philadelphia Eagles. Sports books around Las Vegas opened the Patriots around a 6-point favorite Sunday to win their second straight Super Bowl. They also made New England a big favorite to win the Super Bowl next year in Atlanta. But the closest thing to a lock in this gambling city is that betting on this Super Bowl will smash the existing record of $138.5 million set just last year. “Sports betting couldn’t be more popular than it is now,” said Jay Kornegay of the Westgate Las Vegas sports book.