Joe Biden could learn a thing or two from Elizabeth Warren

Joe Biden could learn a thing or two from Elizabeth Warren

Sanders and Warren have increased their support by 6 percent and 5 percent, respectively, from Monmouth's poll in June.

Warren and Sanders have been vying to present themselves as the standard-bearers of the Democratic Party's progressive wing through bold proposals and grassroots campaigning. He was level with Elizabeth Warren, who gained five points and is also polling at 20 per cent of the national vote.

Fifty percent of voters said they believe electability is more important in a candidate than compatibility with "your views on issues".

Monmouth polling institute director Patrick Murray said: "The main takeaway from this poll is that the Democratic race has become volatile".

When asked for a comment, Biden's campaign pointed to other recent polls, such as the Morning Consult and Emerson, which show the former VP with a commanding lead, although neither are qualifying polls for the Democratic debates.

More news: Spurs need winning run to keep pace with City, Liverpool - Kane

Biden, 76, has looked to stake a more moderate ground, and his campaign has promoted him as the "most electable", meaning the candidate who would give the Democrats the best chance to defeat Trump, 73.

The survey - released Monday - showed the former vice president plunged 13 percentage points from where he stood in June.

The poll of 800 voters included 298 people considered registered Democrats or Democratic-leaning.

But in the next debate, in July, Harris faced sharp criticism by another Democratic presidential candidate, US Congresswoman Tulsi Gabbard of Hawaii, for her record as California attorney general. While a media narrative is developing that it's a three-person race, it's entirely possible that one or more of the candidates now in single digits in the polls will leap up in the weeks ahead. Cory Booker (D-N.J.) and South Bend, Indiana Mayor Pete Buttigieg each with 4 percent, tech entrepreneur Andrew Yang at 3 percent, and former secretary of Housing and Urban Development Julian Castro, former U.S. Rep. Beto O'Rourke (D-TX.) and self-help author Marianne Williamson all at 2 percent.