Poll: Biden supporters warm to Warren as an alternative

A new poll shows that former Vice President Joe BidenJoe BidenGOP chairmen hit back at accusation they are spreading disinformation with Biden probe Trump outraises Biden in July, surpasses billion for the cycle Duckworth: Republican coronavirus package would 'gut' Americans With Disabilities Act MORE’s supporters are starting to warm up to Sen. Elizabeth WarrenElizabeth WarrenBill from Warren, Gillibrand and Waters would make Fed fight economic racial inequalities The other reason Democrats want Biden to shun debates The Memo: Biden faces balancing act MORE (D-Mass.) as a viable alternative, though Sen. Bernie SandersBernie SandersProgressives soaring after big primary night 'Absolutely incredible': Ocasio-Cortez congratulates Cori Bush on upset victory over Lacy Clay Sanders supporters launch six-figure ad campaign explaining why they're voting for Biden 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 Devi HarrisTwitter bans Trump campaign until it deletes tweet with COVID-19 misinformation Virginia mayor refuses to resign over controversial Biden, 'Aunt Jemima' post Exclusive: Democrats seek to increase racial diversity of pandemic relief oversight board 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 ButtigiegCNN's Ana Navarro to host Biden roundtable on making 'Trump a one-term president' Former Indiana Gov. Joe Kernan dies How Republicans can embrace environmentalism and win 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