With Iowa and New Hampshire voters preparing to cast ballots in the coming weeks, a new national poll shows Sen. Elizabeth Warren of Massachusetts faring better than Vermont Sen. Bernie Sanders in a one-on-one matchup with former Vice President Joe Biden.

Sanders this week surged in recent Iowa polling, and he’s also leading several polls in New Hampshire, a primary he won in 2016. Progressives have been concerned that Sanders and Warren could eventually split the left-wing vote, leading to Biden picking up the nomination.

Politico reported that an online survey testing hypothetical matchups showed Biden and Warren nearly neck-and-neck with Biden garnering 47% support compared to Warren’s 45%. A Biden-Sanders matchup showed a bigger divide, with 53% of likely Democratic voters picking Biden and 41% backing Sanders.

The poll, commissioned by progressive group Data for Progress and conducted by YouGov Blue, showed that in a three-way race, 42% said they’d vote for Biden, 30% for Warren and 23% for Sanders.

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