Bernie Sanders Takes on Clinton Welfare Legacy as He Woos Iowa Unions

Hillary Clinton's leading challenger is in Iowa to address local AFL-CIO convention.

Senator Bernard "Bernie" Sanders, an independent from Vermont and possible presidential candidate, pauses before speaking during an interview in Washington, D.C., U.S., on Wednesday, April 15, 2015.

Photographer: Andrew Harrer/Bloomberg

Bernie Sanders says both Clintons made a mistake on welfare reform.

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