Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) has maintained his lead over Democratic presidential front-runner Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE in New Hampshire and pulled to within the margin of error of her in Iowa, a new poll finds.

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According to a NBC News-Wall Street Journal-Marist survey released on Sunday, Clinton has only a 3-point lead over Sanders in Iowa, well within the poll’s 4.8 percentage point margin of error. Clinton takes 48 percent support in the Hawkeye State, compared to 45 percent for Sanders.

That’s a much closer race in Iowa than other recent polls have found. According to the RealClearPolitics average of surveys, Clinton leads by 12.5 points in Iowa.

New Hampshire has long been a more competitive race between the two, and here the poll found Sanders leading with 50 percent of the support over Clinton at 46, in-line with other recent polling. According to the RCP average, Sanders leads by 5.3 points in the Granite State.

The Sanders campaign has been seeking to draw attention to polling that finds the Vermont senator performing better than Clinton in head-to-head match-ups against Republicans in the general election, and the NBC survey confirmed those claims.

Sanders leads GOP front-runner Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE head-to-head by 13 in Iowa, while Clinton only leads him by 8. In New Hampshire the disparity is even greater, with Sanders leading Trump by 19, and Clinton only edging him by 1.

The poll produced similar findings in head-to-head match-ups against Sens. Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE (R-Texas) and Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE (R-Fla.).

The most stunning finding was in New Hampshire, where Rubio leads Clinton 12, but trails Sanders by 9.

Sanders is buoyed in the head-to-head match-ups with Republicans by his strength among independents.

The survey of 2,821 registered voters in Iowa has a 1.8 percentage point margin of error. The survey of 1,888 registered voters in New Hampshire has a 2.3 percentage point margin of error. The surveys of 422 likely Democratic caucus-goers in Iowa and 425 likely Democratic primary voters in New Hampshire have 4.8 percentage point margins of error.