The One Thing Bernie-mentum Can't Overcome: Demographics

But another potential candidate could take the Hillary Clinton challenge that Sanders started, and build on it: Joe Biden.

Supporters cheer while holding up signs during the official kickoff to Senator Bernie Sanders' presidential campaign in Burlington, Vermont, U.S., on Tuesday, May 26, 2015.

Photographer: Scott Eisen/Bloomberg

Could Bernie Sanders really be the nominee? Recently, some on the left have dared to hope. Reports of large, fervent crowds and growing poll results from some early states fueled significant media discussion of a surge for Sanders as he challenges quasi-incumbent Hillary Clinton for the Democratic presidential nomination.

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