Some presidents throw out baseball's first pitch of the season. Some post picks for college basketball's March Madness. One might tweet about a football player kneeling. President Richard M. Nixon phoned Miami Dolphins coach Don Shula to suggest plays for the Super Bowl. He hosted players in the 1969 Major League All-Star game for a party deemed the strangest since the mob scene during Andrew Jackson's inauguration. He attended a Washington Redskins...