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WASHINGTON, DC - MARCH 09:  U.S. Sen. Bernie Sanders (I-VT) waits to be introduced prior to his address to a National Press Club Newsmaker Luncheon March 9, 2015 at the National Press Club in Washington, DC. Sen. Sanders spoke on his life, his political career and his beliefs.  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - MARCH 09:  U.S. Sen. Bernie Sanders (I-VT) waits to be introduced prior to his address to a National Press Club Newsmaker Luncheon March 9, 2015 at the National Press Club in Washington, DC. Sen. Sanders spoke on his life, his political career and his beliefs.  (Photo by Alex Wong/Getty Images)

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    Bernie Sanders gains steam ahead of debate

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Bernie Sanders gains steam ahead of debate

Democratic presidential candidate Bernie Sanders' bid to topple Hillary Clinton's front-runner status is hitting the marks of a serious contender: He's closed the fundraising gap. He's competitive and in some cases leading in early state polls.

Bernie Sanders gains steam ahead of debate

Democratic presidential candidate Bernie Sanders' bid to topple Hillary Clinton's front-runner status is hitting the marks of a serious contender: He's closed the fundraising gap. He's competitive and in some cases leading in early state polls.