NASHVILLE (Reuters) - Hank Williams, Jr. is a country singer, record executive and political pundit, and he wears all those hats on his new CD, "Old School, New Rules". He picks up on politics where he left off last year with some more fighting words for President Barack Obama. Williams calls himself "an executive hillbilly," but he's more than that. The second son in a line of country stars - legend Hank Williams is his dad and country/punk/metal singer Hank III his son - Williams is known for such standards as "Family Tradition" and "A Country Boy Can Survive. ...