A new poll from Fox News shows that while former Vice President Joe Biden is still in the lead in the packed Democratic primary, he is currently polling at his lowest among Iowa voters.

The poll shows Biden, 76, only has 29% of the vote in Iowa, the first state to have a caucus in the primary. In May, he was polling at 35%, and in August he was at 31%. Vermont Sen. Bernie Sanders is in second at 18% and Massachusetts Sen. Elizabeth Warren is in third at 16%.

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