Democratic presidential hopefuls Massachusetts Sen. Elizabeth Warren and former Vice President Joe Biden shake hands as they arrive onstage for the third Democratic primary debate of the 2020 presidential campaign season.

Joe Biden and Elizabeth Warren, holding distinctly different advantages, have separated themselves from the crowded Democratic presidential field, a new NBC News/Wall Street Journal poll shows.

In the survey, conducted after the third in the Democratic Party's series of debate, the former vice president draws 31% compared to 25% for the Massachusetts senator. At 14%, Vermont Sen. Bernie Sanders trails Warren by a double-digit margin while 15 other candidates receive support of 7% or less.

Biden builds his edge on dominance among three chunks of Democratic primary voters. He commands 49% among African-Americans, 46% among senior citizens, and 42% among moderate and conservative Democrats.

But after months of steady progress, Warren boasts formidable strengths of her own. She leads Biden by roughly two-to-one among liberals and Democrats under 35, breaks even among whites, and holds a double-digit edge among those seeking large-scale change in the post-Trump era. That last group represents a majority of the Democratic electorate.

Moreover, Warren now holds a clear edge in enthusiasm. Fully 70% of Democratic primary voters describe themselves as enthusiastic or comfortable about her candidacy, more than for either Biden or Sanders.

As a result, 45% of Democratic primary voters call Warren either their first or second choice. That compares to 41% for Biden, 29% for Sanders, 19% for South Bend, Indiana, Mayor Pete Buttigieg and 14% for California Sen. Kamala Harris.

"Warren becoming a broadly acceptable choice is a very significant development in a multi-candidate field," said Republican pollster Bill McInturff, who conducts the NBC/WSJ poll with his Democratic counterpart Peter Hart. The telephone survey of 506 Democratic primary voters, conducted Sept. 13-16, carries a margin for error of 4.36 percentage points.

Hart cautioned against assuming that the shape of the race has hardened. Past nomination fights, including Barack Obama's battle against Hillary Clinton in 2008 and John Kerry's against Howard Dean and others four years earlier, have shown a propensity for late-breaking developments.

"We're at September," the veteran pollster said.

What's clear so far is the most of the jampacked Democratic field has little to show for the first nine months of 2019. Aside from Biden and Warren, only Sanders has consistently held a substantial, devoted following.

"The race isn't getting broader," McInturff observed.