TALLADEGA, Ala. — Rain and wrecks pushed NASCAR to the edge of darkness Sunday at Talladega Superspeedway, where three of the biggest names in the sport led the field to final flag. NASCAR was giving it one final go to get the rain-delayed race wrapped up, and Matt Kenseth, Carl Edwards and Jimmie Johnson were at the head of the pack for the two-lap overtime sprint to the finish. None of them ever saw David Ragan coming.