Alex McGough tossed three of his four touchdown passes to Deon Cain as the Birmingham Stallions won back-to-back USFL championships with a 28–12 victory over the Pittsburgh Maulers on Saturday night in Canton, Ohio. The Stallions (10–2) trailed 3–0 early then took control of the game, outscoring the Maulers 28–9 over the final three quarters…