Front-runner Joe Biden's support held steady in a new poll of the 2020 Democratic presidential race that saw Sen. Elizabeth Warren (D-Mass.) and South Bend, Ind., Mayor Pete Buttigieg make gains.

The poll from ABC News and The Washington Post released early Sunday found Biden with 27 percent support from Democrats and independents who lean toward the party, unchanged from a similar survey in early September.

Warren, however, gained 4 percentage points, climbing from 17 percent to 21 percent. The results mark a new high in the poll for the senator, ABC News noted.

Buttigieg, who is now at 7 percent, added 3 points since early September.

According to the survey, support for Sen. Bernie Sanders (I-Vt.) was also constant, holding at 19 percent.

Sen. Kamala Harris (D-Calif.) lost 5 points, falling to 2 percent.

Pollsters also found that Biden has 28 percent support among registered voters, while Warren has 23 percent, Sanders has 17 percent and Buttigieg has 9 percent. No other Democratic candidate topped 2 percent in the new survey.

Biden is the favorite of moderates, black voters, men and those above the age of 65, the results show. The former vice president is also seen as having the best chance of beating President Trump, with 42 percent saying he has that attribute, compared to 17 percent who said the same about Warren and 16 percent for Sanders.

The new survey of 1,003 adults was conducted between Oct. 27 and Oct. 30. It has a margin of error of 5.5 percentage points.

Biden leads the 2020 Democratic field by about 7 points in the RealClearPolitics average of polling with 27.6 percent. Warren follows with 20.4 percent. She is trailed by Sanders with 17 percent, Buttigieg with 7.1 percent and Harris with 4.7 percent.

This report was updated at 8:13 a.m.