Democratic voters confident that Biden and Sanders can defeat Trump, less certain about other candidates' chances

Democrats are most confident that former Vice President Joe BidenJoe BidenFive takeaways from Trump's 2020 kickoff rally Five takeaways from Trump's 2020 kickoff rally Sanders tears into Trump in response to campaign kickoff rally MORE and Sen. Bernie SandersBernie SandersFive takeaways from Trump's 2020 kickoff rally Five takeaways from Trump's 2020 kickoff rally Sanders tears into Trump in response to campaign kickoff rally MORE (I-Vt.) can defeat President TrumpDonald John TrumpGOP senator introduces bill to hold online platforms liable for political bias Rubio responds to journalist who called it 'strange' to see him at Trump rally Rubio responds to journalist who called it 'strange' to see him at Trump rally MORE in a general election, according to a new Hill-HarrisX poll.

In the survey, 75 percent of Democratic respondents said that they believed that Biden had a strong or some chance of beating Trump in the general election next year, while 64 percent said the same of Sanders. 

None of the other potential and declared Democratic candidates were rated by more than half of the party's voters as having at least some chance of defeating Trump.

Forty-five percent of Democrats in the survey said that they believed former Rep. Beto O'RourkeBeto O'RourkePoll: Six Dems lead Trump in Florida match-ups Willie Nelson on supporting O'Rourke: 'Anything he wants to do, I'm with Beto' Willie Nelson on supporting O'Rourke: 'Anything he wants to do, I'm with Beto' MORE (D-Texas) had at least some chance of defeating the president, while 43 percent said the same about Sen. Kamala HarrisKamala Devi HarrisBiden, Sanders to be center stage at first debate Biden, Sanders to be center stage at first debate Poll: Six Dems lead Trump in Florida match-ups MORE (D-Calif.).

Forty-two percent of Democrats said that Sen. Elizabeth WarrenElizabeth Ann WarrenSanders tears into Trump in response to campaign kickoff rally Sanders tears into Trump in response to campaign kickoff rally Warren introduces universal child care legislation MORE (D-Mass.) had at least some chance of victory, while only 36 percent said they believed Sen. Cory BookerCory Anthony BookerWarren introduces universal child care legislation Warren introduces universal child care legislation Booker responds to Trump's mass deportation threat: 'This is not who we are' MORE (D-N.J.) had at least some chance of beating Trump, and just 25 percent said the same about Sen. Amy KlobucharAmy Jean KlobucharDemocrats detail new strategy to pressure McConnell on election security bills Democrats detail new strategy to pressure McConnell on election security bills Biden, Sanders to be center stage at first debate MORE (D-Minn.). Seventeen percent said they believed entrepreneur Andrew YangAndrew YangHillicon Valley: Facebook unveils new cryptocurrency | Waters wants company to halt plans | Democrats look to force votes on election security | Advertisers partner with tech giants on 'digital safety' | House GOP unveils cyber agenda Hillicon Valley: Facebook unveils new cryptocurrency | Waters wants company to halt plans | Democrats look to force votes on election security | Advertisers partner with tech giants on 'digital safety' | House GOP unveils cyber agenda Andrew Yang: Not all aspects of China behavior should be viewed as threat MORE had at least some chance.

Biden, who is expected to soon enter the Democratic race, and Sanders have routinely polled at the top of surveys of Democratic voters. The Hill-HarrisX survey suggests Dems desperate to eject Trump from the White House may be gravitating to the two men because they see them as having the best chances to defeat Trump, according to Sophia Tesfaye, the deputy politics editor at Salon.com.

"This time around, especially after 2016 for Democrats, the biggest driver for popularity is can you beat Donald Trump," she said Tuesday on "What America's Thinking."

Both Biden and Sanders are making plays to appeal to white, working-class voters in states such as Pennsylvania, Michigan and Ohio that Trump won in 2016. 

The poll found that 49 percent of Democrats said Biden had a strong chance of winning while 26 percent said he had some chance. Only 10 percent said they believed that Biden had a small chance of winning while just 5 percent said he had almost no chance. Fifteen percent said they were unsure.

Thirty-one percent of Democrats said Sanders had a strong chance of victory while 33 percent said he had some chance of winning. Eighteen percent said that Sanders had only a small chance of beating the president while 7 percent said they believed he had almost no chance. Twelve percent were unsure.

Republicans polled thought that all of the Democratic hopefuls would fall to Trump, but Biden is seen as the greatest threat.

Thirty-two percent said Biden had at least some chance of victory, compared to 28 percent for Sanders. Just 17 percent said O'Rourke had at least some chance of victory while 16 percent said Booker had some chance. All the other aspirants were rated as having lower odds by GOP voters.

Independents were also more skeptical of the Democratic candidates' chances. Forty-one percent said they believed Biden had at least some chance of willing while 39 percent said that Sanders did.

Twenty-seven percent of respondents who identified as independents said that O'Rourke had at least some chance of victory while 24 percent said the same about Harris. Nineteen percent of independents said that Warren had at least some chance and 18 percent said Booker had a chance to win. The other candidates trailed with less than 15 percent of independents saying they had at least some chance.

Overall, 50 percent of registered voters of all stripes said that Biden had at least some chance compared to 44 percent for Sanders, 30 percent of O'Rourke, 28 percent for Harris, and 26 percent for Warren. Twenty-four percent said Booker had at least some chance.

"For candidates that have very high name recognition, like Elizabeth Warren, Joe Biden, or Bernie Sanders, this is not good news," Dritan Nesho, the CEO of HarrisX said.

"I think the other candidates that have a lot of room to grow will see their numbers shift up and it seems to me that that's where the problem is and the traction might be in the future months," Nesho added.

Across age groups and among voters of all partisan persuasions, Biden was the Democratic hopeful that voters said had the best odds with around 50 percent saying he had at least some chance of victory. But among younger voters — those between 18 and 34 years of age — 53 percent said they believed that Sanders could defeat Trump. Assessments of the senator's chances were lower among voters 35 and up.

A Hill-HarrisX survey released Monday found that 28 percent of Democratic and independent voters said they supported Biden to become the Democratic presidential nominee, 20 percent backed Sanders, 8 percent backed O'Rourke and Warren, and 6 percent preferred Booker.

—Matthew Sheffield