A new book by 'New York Times' reporter Charlie Savage, 'Power Wars,' suggests that there has been little substantive difference between George W. Bush's administration and Obama's when it comes to national-security policies or the legal justifications used to pursue regime change in the Greater Middle East.

A new book by 'New York Times' reporter Charlie Savage, 'Power Wars,' suggests that there has been little substantive difference between George W. Bush's administration and Obama's when it comes to national-security policies or the legal justifications used to pursue regime change in the Greater Middle East.