August 31, 2015 6:26 AM EDT

Vermont Sen. Bernie Sanders and businessman Donald Trump — the two biggest anti-establishment candidates in the Democratic and Republican presidential primary fields, respectively — have seen their support surge, according to a new survey of voters likely to participate in the Iowa caucuses.

In the Des Moines Register/Bloomberg Politics poll, Sanders is now polling just seven points behind Democratic front runner Hillary Clinton, nearly doubling his share of the vote since the last survey was conducted in May.

Sanders takes 30 percent support, while Clinton draws 37 percent, marking the first time she’s dropped below 50 percent in the poll…

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