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Democratic U.S. presidential candidates (L-R) former Governor Martin O'Malley, former Secretary of State Hillary Clinton and Senator Bernie Sanders pose together before the start of the NBC News - YouTube Democratic presidential candidates debate in Charleston, South Carolina January 17, 2016. REUTERS/Randall Hill - RTX22T3M,Democratic U.S. presidential candidates (L-R) former Governor Martin O'Malley, former Secretary of State Hillary Clinton and U.S. Senator Bernie Sanders pose together before the start at the NBC News - YouTube Democratic presidential candidates debate in Charleston, South Carolina January 17, 2016. REUTERS/Randall Hill  - RTX22T4H Randall Hill/Reuters