George Washington leads his troops across the Delaware River in 1776 during the Revolutionary War in this painting by Emanuel Leutze. AP hide caption

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In Prague on Thursday, President Obama and Russian President Dmitry Medvedev signed an arms reduction treaty. But fears of an attack by a nuclear-armed superpower have given way to concerns about a nuclear-armed terrorist. Yuri Kadobnov/AFP/Getty Images hide caption

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Current law punishes people who possess crack, which is much cheaper than powder, 100 times more heavily than people who possess powder cocaine. AP hide caption

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