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Clinton fires back at Sanders over fossil fuel money claim

Tension is building for the Democrats in New York, where Hillary Clinton and Bernie Sanders campaigned Thursday. The next primary is in Wisconsin on Tuesday, with 86 delegates up for grabs. A win in that primary on would have enormous meaning for both candidates. Clinton showed frustration during one of her rallies, battling an activist who questioned a source of her political donations. Julianna Goldman reports from Washington.
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