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With the Iowa caucuses less than three weeks away, a new poll in Iowa shows a neck-and-neck race between Hillary Clinton and Bernie Sanders in the state.

The Des Moines Register/Bloomberg poll released Thursday morning shows Clinton with the support of 42 percent of likely Democratic caucus-goers, compared to 40 percent for Sanders. Former Maryland governor Martin O'Malley received just four percent support.

Clinton led Sanders by nine points in the same poll last month, 48 percent to 39 percent.

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As the countdown to the caucuses continues, 40 percent of Democrats say they could be persuaded to change their minds about their first choice candidate.

Sanders is running strong with young voters and with those who say they plan to attend their first caucus on February 1 — the same type of coalition that helped Barack Obama surge to victory over Clinton in Iowa in 2008.

Among those younger than 45, Sanders bests Clinton 59 percent to 27 percent. And among those who say they plan to attend their first caucus, he leads 52 percent to 34 percent.

Clinton wins with older Democrats (56 percent to 26 percent) and women (49 percent to 32 percent).

Both candidates remain popular with Democrats in the state. Eighty-nine percent said they view Sanders favorably, while 86 percent said the same of the former secretary of state.