Hillary Clinton backed by 50%, Bernie Sanders by 31% in first CNN/ORC poll of likely Democratic caucus goers in Iowa.
- Vice President Biden, who has yet to decide if he will seek Democratic presidential nomination, in third place at 12%
- Rest of Democratic field at 1% or less
- Poll of 429 likely participants in Iowa Democratic caucuses conducted Aug. 7-11; error margin +/-4.5ppts
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