Sen. Elizabeth Warren was third at 9 percent, former New York City Mayor Mike Bloomberg and Sen. Cory Booker tied at 4 percent, and entrepreneur Andrew Yang garnered 3 percent.

Billionaire Tom Steyer and former South Bend, Ind., Mayor Pete Buttigieg registered at 2 percent respectively. The rest of the candidates received less than 1 percent.

The survey also showed Biden was best placed among the field to defeat Donald Trump, although the president performed poorly against any Democratic candidate.

A December poll for the BlackPAC political action committee showed Biden had 44 percent support among prospective black voters, a key Democratic bloc.

Six candidates have been invited to participate in next week's presidential primary debate in Iowa ahead of the Feb. 3 caucuses, with no candidates of color making the cut, the Democratic National Committee announced Saturday.

Sanders has a slight lead over a tightly packed group of Democratic frontrunners in Iowa, according to a Des Moines Register/Mediacom/CNN survey published Friday.

The Post-Ipsos survey was conducted Jan. 2-8 among 1,088 non-Hispanic black adults, including 900 registered voters, drawn from an online survey panel recruited through random sampling of households across the country.

Overall results have a margin of sampling error of plus or minus 3.5 percentage points.