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WASHINGTON - APRIL 28:  U.S. Sen. Bernard Sanders (I-VT) speaks during a news conference April 28, 2010 on Capitol Hill in Washington, DC. The news conference was to discuss the need for an open, public floor debate on Wall Street accountability legislation.  (Photo by Alex Wong/Getty Images)
WASHINGTON - APRIL 28:  U.S. Sen. Bernard Sanders (I-VT) speaks during a news conference April 28, 2010 on Capitol Hill in Washington, DC. The news conference was to discuss the need for an open, public floor debate on Wall Street accountability legislation.  (Photo by Alex Wong/Getty Images)

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    Bernie mania in full swing

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Bernie mania in full swing

Democratic presidential candidate Bernie Sanders is generating positive buzz on the campaign trail. CNN's Sunlen Serfaty reports.

Bernie mania in full swing

Democratic presidential candidate Bernie Sanders is generating positive buzz on the campaign trail. CNN's Sunlen Serfaty reports.