George Bush's "war on terror" left America with a scarred reputation and many disturbing questions. Barack Obama has said that he wants to move forward, rather than look back. That is understandable. The new president has an ambitious agenda. Prising open the lid on previous mistakes might unleash a political hornet-swarm. But this week, with Mr Obama bunkered on Martha's Vineyard, an ugly past roared into the present.
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