Josh Brolin is
George W. Bush
Like Dubya, Brolin has a family ranch and Texas connections but comes from far too much money to be a real cowboy. Also like the President, Brolin has a famous father (James Brolin) and went through long wilderness years before his triumphant string of successes in 2007. It's uncannily good casting! One caveat: Brolin appears a good bit smarter than George W. "I know that human beings and fish can coexist peacefully" Bush.