dnt yellin iowa caucuses past_00013004
dnt yellin iowa caucuses past_00013004

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    A look back at past Iowa caucuses

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A look back at past Iowa caucuses

CNN's Jessica Yellin takes a look at past Iowa caucuses and their impact on the presidential election.

A look back at past Iowa caucuses

CNN's Jessica Yellin takes a look at past Iowa caucuses and their impact on the presidential election.