PRESIDENT OBAMAS speech on national security last week was a dense thicket of self-justifying argument,but its central message was perfectly clear: Please dont worry,liberals. Im not George W. Bush. You can see why his supporters might be getting nervous on that front. The continuities between Obama and Bush on national security have always been there for those with eyes to see,but much more attention has been paid to them of late to the expansive drone campaign that has targeted American citizens for execution without trial,to an anti-leaks campaign that has flirted with criminalising investigative reporting,and to the perpetual postponement of supposed administration priorities like shuttering the prison at Guantánamo.

The problem is that by making it sound as if US policy is about to change more than it will,the presidents rhetoric risks coming across as a bait and switch.

Against this backdrop,the presidents rhetoric was calculated to reassure and soothe. The promises he made in 2008,when he campaigned as a critic of wartime overreach,were revived,reasserted,amplified. He would push anew to close Gitmo… phase out indefinite detention… put limits on drone strikes… safeguard a free press… even wind down the war on terror. But of course the year is no longer 2008,and Obama has been the decider for more than four years now. Which meant that his address had an air of self-critique thats rare in presidential rhetoric. In the words of Esquires Tom Junod,one of the most perceptive writers on Obamas drone policy,the speech didnt just speak to Americans in the language of moral struggle. It tried to make the president himself representative of moral struggle, by turning personal,almost confessional,in its weighing of doubt and its admission of second thoughts.

This willingness to grapple with moral complexity has always been one of the things that Obamas admirers love about him,and even liberals who feel disappointed with his national security record still seem grateful for the change from George W. Bush. I am not particularly nostalgic for the Bush era either. But Obamas Reinhold Niebuhr act comes with potential costs of its own. While the last president exuded a cowboyish certainty,this president is constantly examining his conscience in public but if their policies are basically the same,the latter is no less of a performance. And there are ways in which it may be a more fundamentally dishonest one,because it perpetually promises harmonies that cant be achieved and policy shifts that wont actually be delivered.

Thats a cynical reading on Obamas speech,but it feels like the right one. Listened to or skimmed,the address seemed to promise real limits on presidential power,a real horizon for the war on terror. But when parsed carefully,its not clear how much practical effect its promises will have.

Over all,as the Brookings Institutions Benjamin Wittes put it,the speech seemed written to align Obama as publicly as possible with the critics of the positions his administration is taking without undermining his administrations operational flexibility in actual fact. There are obviously good reasons to preserve this flexibility. The problem is that by making it sound as if American policy is about to change more than it actually will,the presidents rhetoric risks coming across as a bait and switch on his supporters at home,but more important,on audiences across the Muslim world.