A new report says federal prison officials rarely grant "compassionate release," even for the most gravely ill inmates. iStockphoto.com hide caption

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Army Pfc. Bradley Manning is escorted out of a courthouse in Fort Meade, Md., after a pretrial hearing in June. Manning is charged with aiding the enemy by giving hundreds of thousands of classified diplomatic cables and war logs to the secret-sharing website WikiLeaks. Patrick Semansky/AP hide caption

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A worker inspects a marijuana plant at a grow house in Denver on Nov. 8. Ed Andrieski/AP hide caption

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David Petraeus, then-CIA director, testifies before the Senate Intelligence Committee in January. Petraeus resigned Friday after acknowledging an extramarital affair. Karen Bleier/AFP/Getty Images hide caption

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Members of Congress want to know why they didn't know more about the investigation involving former CIA Director David Petraeus, seen here testifying on Capitol Hill on Feb. 2. Cliff Owen/AP hide caption

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Sen. Scott Brown, R-Mass., shakes hands with Democratic challenger Elizabeth Warren at their Oct. 1 debate in Lowell, Mass. The race is one of a handful of contests that could determine party control of the Senate. Charles Krupa/AP hide caption

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Democrat Elizabeth Warren takes the stage after defeating incumbent GOP Sen. Scott Brown in the Massachusetts Senate race on Tuesday. Michael Dwyer/AP hide caption

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