"One question, Mr. President," read the words on the front cover of this week's Economist, behind a silhouette of the back of Barack Obama's head, "just what would you do with another four years?" It's a good question, and one that's still open as Barack Obama prepares to deliver his acceptance speech at the Democratic National Convention in rainstorm-plagued Charlotte Thursday night. Other presidents seeking re-election have usually provided a more or less convincing answer. George W. Bush said he would try to reform Social Security and advance energy...

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