Biden extends lead; Sanders, Warren see support grow in new poll

Former Vice President Joe BidenJoe BidenBiden set to make risky economic argument against Trump Hillicon Valley: Tech companies lead way on WFH forever | States and counties plead for cybersecurity assistance | Trump weighing anti-conservative bias panel What does Joe Biden believe about NASA, space exploration and commercial space? MORE's support jumped 5 points, slightly extending his lead over Sen. Bernie SandersBernie SandersHillicon Valley: Tech companies lead way on WFH forever | States and counties plead for cybersecurity assistance | Trump weighing anti-conservative bias panel Biden wins Hawaii primary Warren to host high-dollar fundraiser for Biden MORE (I-Vt.) in the latest Hill-HarrisX poll. 

The survey showed that 34 percent of likely Democratic primary voters back Biden, marking a 14-point lead over Sanders.

It also found rising support for Sanders and Sen. Elizabeth WarrenElizabeth WarrenPentagon charts its own course on COVID-19, risking Trump's ire Warren to host high-dollar fundraiser for Biden It's as if a Trump operative infiltrated the Democratic primary process MORE (D-Mass.), the only other two candidates in double figures in the poll.

Sanders jumped by 4 percent to 20 percent and Warren by 3 percent to 12 percent.

Sen. Kamala HarrisKamala Devi HarrisTrump retweets personal attacks on Clinton, Pelosi, Abrams It's as if a Trump operative infiltrated the Democratic primary process OVERNIGHT ENERGY: Coal company sues EPA over power plant pollution regulation | Automakers fight effort to freeze fuel efficiency standards | EPA watchdog may probe agency's response to California water issues MORE (D-Calif.) is in fourth place with 9 percent support, but her numbers have dropped by 2 percent since the last poll conducted two weeks ago. South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegIt's as if a Trump operative infiltrated the Democratic primary process Here's how Biden can win over the minority vote and the Rust Belt The Hill's Campaign Report: Democrat concedes in California House race MORE rounded out the top five with 5 percent, a 4 percent jump over two weeks. 

Former Rep. Beto O’Rourke (D-Texas), meanwhile, dropped to sixth place with 4 percent support.

The new poll also suggests that a growing number of Democratic voters are starting to make up their minds about which candidate to back.

The survey showed that the number of undecided voters dropped to 8 percent from 17 percent.

The latest poll can be viewed as welcome news for Sanders, Biden and Warren going into the second round of primary debates. Earlier this month, Biden’s support slipped below 30 percent, his lowest mark in the Hill-HarrisX survey to date.

The Democrats are poised to face-off again in two debates this week in Detroit.

Warren and Sanders are set to headline the first of debates on Tuesday, while Biden will take center stage along with Harris the following night.

This marks the first time Warren and Sanders will have shared the debate stage. Both liberal heavyweights have largely avoided criticizing each other but could look to set themselves apart as the top progressive candidate. 

The lineup also marks a potential rematch for Biden and Harris, who clashed during the last debate over civil rights issues. 

Leading up to the debate, Harris unveiled her health care plan, which seeks to expand coverage without getting rid of private insurance.

The plan has already drawn fire from both Sanders and Biden alike.

While Biden accused Harris of backtracking on her pledge to support “Medicare fo All,” Sanders slammed the plan for what he characterized as relying too heavily on private insurance. 

The Hill-HarrisX survey was conducted online among 1,000 registered voters. The sampling margin of error is plus or minus 3.1 percentage points.

—Tess Bonn