Official_portrait_of_Barack_ObamaHow powerful is he? Let’s count the ways: Presides over world’s largest, most innovative, most dynamic economy; commander-in-chief of planet’s richest, deadliest military; finger on button of nuclear arsenal containing more than 5,000 warheads; head-of-state of world’s sole superpower; his Democrats have majorities in both U.S. House and Senate; recently awarded Nobel Peace Prize.

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