SYLVANIA – While waiting for the meal at the Republican 12th Congressional District Fish Fry, the party’s nominee, Rick Allen, cited a forecast that gives him a better than even chance of unseating U.S. Rep. John Barrow, the Democrat who has held the seat for almost 10 years. Barrow has fended off a series of Republican challengers at two-year intervals, despite the Republican-controlled state Legislature twice redrawing the district. But after a 54 percent win without a runoff in the five-candidate primary, Allen has what some area GOP leaders say is their party’s best chance to recapture the district since Barrow’s narrow 2006 rematch victory over his Republican predecessor, Max Burns.