A new national survey shows “Biden survives, Warren thrives and Harris dives” following the second Democratic primary debate in Detroit last week, according to Quinnipiac University Poll’s Tim Malloy.

“Sen. Elizabeth Warren’s policy heavy presentation and former Vice President Joseph Biden’s ability to handle the heat from all corners put them on top,” the poll’s assistant director said. “Sen. Kamala Harris, whose 20 percentage score put her neck-and-neck with Biden in the Quinnipiac University poll July 2 after the first debate, is now a distant fourth with 7 percent.”

The poll involved 807 Democrats and independent voters who lean Democrat interviewed between August 1-5. More than 80 percent said they watched or listened to most of the two-night debate or followed news closely afterward.

Harris gained momentum following the first debate in North Carolina when she attacked Biden over the former vice president’s support for segregated busing as a senator, but attacks on her record as a prosecutor from Rep. Tulsi Gabbard during the second debate appears to have cut her support among black voters.

“Sen. Harris says she’s proud of her record as a prosecutor and that she’ll be a prosecutor president, but I’m deeply concerned about this record,” Gabbard said. “There are too many examples to cite but she put over 1,5000 people in jail for marijuana violations and then laughed about it when she was asked if she ever smoked marijuana.”

Gabbard also detailed how Harris fought to preserve a cash bail system, argued to keep an innocent man on death row, and resisted parole for prisoners used as cheap labor to fight wildfires during her tenure as the state’s top cop.

The truth didn’t sit well with black voters, who are disproportionately impacted by those harsh policies.

The new Quinnipiac poll registered just 1 percent support for Harris among black Democrats, compared to 27 percent who support Biden, 16 percent who support Vermont Socialist Sen. Bernie Sanders and 8 percent who support Warren.

She also came in last place among the top contenders for support among women, very liberal Democrats, and somewhat liberal Democrats.

“Women Democrats go 31 percent for Biden, 24 percent for Warren, 10 percent for Sanders and 7 percent for Harris,” according to the poll. “Very liberal Democrats go 40 percent for Warren, 20 percent for Sanders, 19 percent for Biden and 7 percent for Harris.

“Somewhat liberal Democrats go 28 percent for Biden, 20 percent for Warren, 14 percent for Sanders and 10 percent for Harris.”

With “moderate/conservative” Democrats, Harris tied with openly gay South Bend Mayor Pete Buttigieg at 4 percent support, behind Sanders with 9 percent, Warren with 11 percent, and Biden with 43 percent.

It was a similar story when it comes to who Democrats think would be the best leader, or has the best policy ideas, or the candidate with the best chance of beating President Trump in 2020, and who performed the best at the debates, all categories Harris trailed behind Sanders, Warren, and Biden.

Harris did beat out some contenders in other categories. Of the 81 percent of respondents who followed the Detroit debate, 7 percent think she did the “worst job.” Nine percent of respondents in that group gave the honor to Williamson, another 9 percent said Biden performed the worst, while New York City Mayor Bill de Blasio and former Rep. John Delaney both garnered 6 percent in the worst performance category.