Vermont Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I) has separated from the pack of Democratic White House hopefuls in New Hampshire, opening up a 15-point lead over the next closest contender, according to a new poll.

The latest American Research Group (ARG) survey finds Sanders in first place at 28 percent support, followed by former Vice President Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE at 13, former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE at 12 and Sen. Elizabeth Warren Elizabeth WarrenGOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (D-Mass.) at 11. Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) comes in at 8 percent support, followed by Sen. Amy Klobuchar Amy KlobucharBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Klobuchar: GOP can't use 'raw political power right in middle of an election' MORE (D-Minn.) at 7 percent.

Six percent of Democratic and independent voters in New Hampshire say they’re undecided.

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The ARG survey shows Sanders with a larger lead than other recent polls have found. Sanders leads by 8 points in New Hampshire in the RealClearPolitics average, with the other most recent surveys finding him ahead by between 5 points and 12 points.

New Hampshire can be difficult to survey because of uncertainty about how many undeclared voters will turn out for the Democratic primary on Election Day.

For instance, Gabbard’s share of the vote is higher in the ARG poll than in any other survey because of her strong support from independent voters. The Hawaii Democrat pulls only 3 percent support in this survey from Democrats but has 15 percent among undeclared voters.

New Hampshire is peculiar in that it has about 413,000 undeclared voters, compared with 288,000 registered Republicans and 275,000 registered Democrats.

The undeclared voters can participate in the Democratic primary.

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Sanders has a 15-point lead over Biden among Democrats, and he leads Buttigieg by 7 points among undeclared voters.

The Vermont senator has a massive lead of 32 points among voters aged 18 to 44. Among voters 45 and older, Sanders is at 19 percent support, followed by Biden at 17 percent.

Sanders has a 9-point lead over Biden among men and a 10 point lead over Warren among women.

The American Research Group survey of 335 Democrats and 265 undeclared voters in New Hampshire was conducted between Jan. 24 and Jan. 27 and has a 4 percentage point margin of error.

Updated 4:49 p.m.