Poll: Biden supporters warm to Warren as an alternative

A new poll shows that former Vice President Joe BidenJoe BidenGOP eyes booting Democrats from seats if House flips Five House members meet with Taiwanese president despite Chinese objections Sunday shows preview: New COVID-19 variant emerges; supply chain issues and inflation persist MORE’s supporters are starting to warm up to Sen. Elizabeth WarrenElizabeth WarrenPoll: Harris, Michelle Obama lead for 2024 if Biden doesn't run Biden eyes new path for Fed despite Powell pick Equilibrium/Sustainability — Presented by Southern Company — Storms a growing danger for East Coast MORE (D-Mass.) as a viable alternative, though Sen. Bernie SandersBernie SandersFive ways Senate could change Biden's spending plan Poll: Harris, Michelle Obama lead for 2024 if Biden doesn't run Bernie Sanders' ex-spokesperson apprehensive over effectiveness of SALT deductions MORE (I-Vt.) is still the preferred second choice. 

The Hill-HarrisX poll released on Monday found that 20 percent of likely Democratic voters who support Biden would support Warren as their second choice, which marks a 12-point increase from when an identical poll was conducted in May.

However, Sanders still remains the top second-choice candidate among Biden supporters at 35 percent, an 8-point increase from the May 3-4 poll.

Another 10 percent of Biden supporters said they would back Sen. Kamala HarrisKamala HarrisStowaway found in landing gear of plane after flight from Guatemala to Miami A sad reality: In a season of giving, most will ignore America's poor Republicans struggle to save funding for Trump's border wall MORE (D-Calif.), a 5-point dip from the last poll. Former Rep. Beto O’Rourke (D-Texas) garnered 5 percent support, a 6 point fall. South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegAdvocates see pilot program to address inequalities from highways as crucial first step Poll: Harris, Michelle Obama lead for 2024 if Biden doesn't run Five reasons for Biden, GOP to be thankful this season MORE (D) followed, dipping to 7 percent from 10 percent.

Other polls have shown similar results.

According to a weekly Morning Consult data tracker, 25 percent of Biden's supporters said they backed Sanders as their second choice, compared to 20 percent who chose Warren as their next favorite. Harris was named as the second option by 14 percent, according to the poll's latest figures that were updated last week. 

The survey comes as the Democratic primary heats up, though signs are emerging that the race is becoming a four-way race between Biden, Sanders, Warren and Harris.

The Hill-HarrisX survey was conducted among 138 Democratic and Democratic-leaning Biden supporters between Aug. 16 and 17 with a margin of error of plus or minus 8 percentage points.

—Tess Bonn