The United States is considered a puritanical society by many Western nations. For example, they can't believe we hassle public servants like General David Petraeus because he had a mistress. In France, if a powerful man doesn't have a mistress, he's considered a wimp.
The oil companies are regulated by the federal government. They can't drill on land nor in American waters without permission from the feds. Many Republicans want to drill baby drill but what's the point if all the oil goes to China? Increased production obviously doesn't mean lower prices for us.