Poll: Biden, Sanders tied in first with Pete right behind

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Gravis Marketing, a nonpartisan research firm, conducted a random survey of 590 registered Democratic voters across Iowa. The poll was conducted from April and has a margin of error of ±4.0%. The totals may not round to 100% because of rounding. The survey was conducted using interactive voice responses and an online panel of cell phone users. The results are weighted by voting demographics. The poll was paid for by GMI.

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