As Tony Blair prepares to step down as UK Prime Minister, his legacy is dominated by one word: Iraq. But history may judge him by another standard: his support for the arts. “During his decade in office Britain has shaken off its creative lethargy and emerged as the liveliest cultural territory in the West. And even if Mr. Blair himself is not much loved in artistic circles, this metamorphosis has taken place under his watch. So does he deserve credit?”