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Iowans wait for a campaign rally to begin.
Iowans wait for a campaign rally to begin.

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    Iowa caucus-goers, by the numbers

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Iowa caucus-goers, by the numbers

CNN's Brian Todd looks at census numbers from Iowa to see if it truly represents the rest of the country.

Iowa caucus-goers, by the numbers

CNN's Brian Todd looks at census numbers from Iowa to see if it truly represents the rest of the country.