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Democratic presidential candidate and former U.S. Secretary of State Hillary Clinton speaks to guests gathered for a campaign event on the campus of Des Moines Area Community College on August 26, 2015 in Ankeny, Iowa.
Democratic presidential candidate and former U.S. Secretary of State Hillary Clinton speaks to guests gathered for a campaign event on the campus of Des Moines Area Community College on August 26, 2015 in Ankeny, Iowa.

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    Clinton campaign pushes restart button

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Clinton campaign pushes restart button

Democratic presidential front-runner Hillary Clinton hits new low in a national poll, while Vice President Joe Biden's poll numbers are rising. CNN's Brianna Keilar reports.

Clinton campaign pushes restart button

Democratic presidential front-runner Hillary Clinton hits new low in a national poll, while Vice President Joe Biden's poll numbers are rising. CNN's Brianna Keilar reports.