Immigration is the next big thing in political hot buttons, but who wins and who loses? Both parties are divided within their own ranks on how to position themselves for maximum advantage on an issue that is rising quickly toward the social and political surface. Both sides agree it could be a deciding factor in many races in next year’s midterm election. “It is the strongest issue out there for the blue-collar white males,” says Dave “Mudcat” Saunders, a Virginia-based Democratic consultant who is co-author of an upcoming book, “Foxes in the Henhouse,” which will suggest ways his party can...