Obama has consistently said he does not want to rake over history, fearing that it will deflect attention from his heavy domestic and foreign policy programme. But this week he opened the way for the prosecution of senior figures in the Bush administration and the establishment of a congressional inquiry.Amid the uproar this created, he has since been backing off. Both he and the Democratic leader of the Senate, Harry Reid, have signalled their unwillingness to hold a truth commission, but the Democratic leader in the House, Nancy Pelosi, appears ready to push ahead. With so much clamour for an investigation, it is almost certain that Congress will hold one, with or without the backing of the White House.