In Iowa however, Biden and Warren remain neck and neck, with Biden at 21 percent and Warren just 0.3 points behind at 20.7 percent according to Real Clear Politics' aggregate with the polls showing a statistical tie between the two in the critical first-in-the-nation caucus state. In second is Warren at 16% and Sanders at 12%.
The poll's margin of error is +/- 2.4 percent. Bernard Sanders of Vermont at 16%, the poll said.
Mr Biden, a former US Vice President, and Mrs Warren, a senator for MA are closely tied with 18 per cent and 17 per cent of support respectively in a survey of 500 likely Democratic voters in the state. The former vice president's 15 percentage point lead was his largest since April in CNN polling. Asked whether the reports hurt or helped Biden's ability to defeat President Donald Trump should the former DE senator be the Democrat's presidential nominee, 44% surveyed said there was no impact.
Pete Buttigieg, the mayor of South Bend, Indiana, who was initially seen as a long-shot presidential contender, has surged within striking distance of former vice-president Joe Biden and Massachusetts Sen. Amy Klobuchar with 3 percent.
No one else in the survey reached double-digit support. None of the other 15 (!) candidates in the race made it into double digits. But while the former vice president declined in standing, voters still said they thought that he had the best chance of beating Trump in the 2020 election. That's up 14 points since the last poll and a whopping 31 points higher than the progressive Warren, his closest competitor among those voters. Elizabeth Warren will soon be releasing a plan on funding of the policy.
Joe Biden is so far ahead of his more liberal presidential rivals that he can barely hear them shouting about income inequality and government-run health care.
The Quinnipiac University poll was conducted October 17 - 21, with 1,587 self-identified registered voters - including 713 Democratic voters and independents who lean toward the Democratic Party, questioned by live telephone operators.
The poll was conducted after the fourth round Democratic primary debate in OH last week, with a margin of error of 4.4 percentage points.