No one is immune to the charms of “Wagon Wheel” — not even Alabama football legend Nick Saban. Darius Rucker is a noted college football fan, and for College GameDay on Saturday (Sept. 14), the country star was back in his home state to support his team, the South Carolina Gamecocks, during their match-up against the LSU Tigers. He delivered a pre-game performance, offering renditions of “Beers and Sunshine” and, of course, his quintessential hit “Wagon Wheel.” “Wagon Wheel” is arguably the most popular sing-a-long in country music, or in any genre, period. Fans watching Rucker’s performance w…