Bernie Sanders sits just 7 points back from Hillary Clinton in the latest Iowa poll

Sen. Bernie Sanders (I-Vt.) is gaining ground on Democratic presidential frontrunner Hillary Clinton in Iowa, which will hold the country's first caucuses Feb. 1. The Des Moines Register/Bloomberg Politics poll released Saturday shows Sanders just 7 percentage points behind Clinton's 37. She's lost a third of her Iowa support since May.

Vice President Joe Biden, who is rumored to be considering a campaign, took 14 percent out of the 404 likely caucus voters polled.

On the Republican side, retired neurosurgeon Ben Carson sits in second at 18 percent to Donald Trump's 23 percent. Only 29 percent of likely Republican caucusgoers said they'd never vote for Trump, a figure that's halved since May.

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