最新10月份的民意调查显示，前副总统乔·拜登领先，民主党初选中可能投票的人的支持是马萨诸塞州参议员伊丽莎白·沃伦的两倍，佛蒙特州参议员伯尼·桑德斯位居第二。
哈佛大学联合政治学院/哈里斯学院与广泛的全国民意调查中看到的趋势背道而驰全国民意测验10月29日至31日的记录显示，拜登在2020年民主党初选中远远领先于桑德斯和沃伦。这项调查对美国成年选民的全国样本进行了调查，询问他们“最有可能在民主党初选中投票给谁”，结果发现拜登获得了33%的支持，桑德斯获得了18%的支持，沃伦获得了15%的支持。拜登、桑德斯和沃伦都有从最高位置交易出去在最近几周全国和各州对可能的民主党初选选民的投票中。
在民主党人和独立党人的总数中，拜登仍然领先桑德斯10个百分点，领先佛蒙特州参议员15个百分点，领先25个百分点。沃伦再次以12%的支持率位居第三。
领先的民主党候选人三人组仍然远远领先于所有其他候选人，加州参议员卡马拉·哈里斯仅落后5%，位居第四。印第安纳州南本德市市长皮特·巴蒂吉获得4%的支持，新泽西参议员科里·布克以3%的支持率追平明尼苏达州参议员艾米·克洛布查尔。
哈佛大学联合政治学院/哈里斯全国民调发现，当所有政治党派的美国成年选民被问到时，没有宣布参选的前国务卿希拉里·克林顿仅次于桑德斯，位居第二。拜登仍然勉强位居榜首，但与克林顿在11%的支持率齐头并进。
但是纽约时报/锡耶纳学院投票在10月25日至30日进行的一周前，沃伦在爱荷华州一场势均力敌的核心小组选举中胜出。当被问及哪一位民主党人是二月份爱荷华州核心会议的首选时，沃伦以22%的票数领先，紧随其后的是桑德斯19%，巴蒂吉18%，拜登17%。
如同纽约时报国家政治记者阿历克斯·伯恩斯著名的在周五的投票中，拜登的支持绝大多数来自年长的选民。在爱荷华州65岁以上的成年人中，拜登显然是领先者。但是在45岁以下的选民中，拜登只持有2%的选票。
在爱荷华州党团投票中，克洛布查尔、哈里斯和杨安泽都徘徊在5%以下。本周退出竞选的德克萨斯州前国会议员贝托·奥洛克在哈佛大学联合政治学院/哈里斯民意测验中努力争取超过2%的支持。
哈佛大学联合呼吁程序/哈里斯调查收集了1810名全国注册选民的回答。
参议员伯尼·桑德斯、前副总统乔·拜登、参议员伊丽莎白·沃伦和南本德市长皮特·巴蒂吉格于10月15日在俄亥俄州韦斯特维尔市奥特本大学的民主党总统辩论前被介绍。
JOE BIDEN LEADS AHEAD OF BERNIE SANDERS AND ELIZABETH WARREN IN LATEST POLL
Former Vice President Joe Biden leads ahead with twice the support from those likely to vote in a Democratic primary compared to Massachusetts Senator Elizabeth Warren, with Vermont Senator Bernie Sanders pulling in second, the latest October poll shows.
Bucking the trend seen in a wide swath of national polls, the Harvard CAPS/Harris national poll recorded between October 29-31 shows Biden far ahead of Sanders and Warren in the 2020 Democratic primary. The poll, which questioned a national sample of U.S. adult voters about who they are "most likely to vote for in a Democratic primary," found Biden with 33 percent of support compared to Sanders with 18 percent and Warren at 15 percent. Biden, Sanders and Warren have all traded off the top spot in nationwide and state-by-state polls of likely Democratic primary voters in recent weeks.
Among Democrats and Independents combined, Biden still holds a 10 percentage point lead over Sanders, with 25 to the Vermont senator's fifteen. Warren again comes in third with 12 percent of support among the two voter bases.
The trio of front-runner Democratic candidates remains far ahead of all other candidates, with California Senator Kamala Harris trailing in fourth place at just 5 percent. South Bend, Indiana Mayor Pete Buttigieg holds 4 percent of support and New Jersey Senator Cory Booker tied Minnesota Senator Amy Klobuchar with 3 percent apiece.
The Harvard CAPS/Harris national poll found that when U.S. adult voters across all political affiliations were asked, former Secretary of State Hillary Clinton, who has not announced she is running, comes in second place just ahead of Sanders. Biden is still barely atop that poll, but is neck and neck with Clinton at 11 percent.
But a New York Times/Siena College poll conducted the week before from October 25-30 finds Warren atop a close Iowa caucus race. When asked which Democrat is their first choice in the February Iowa caucuses, Warren leads with 22 percent, followed by Sanders at 19 percent, Buttigieg at 18 percent and Biden with 17 percent.
As The New York Times national political correspondent Alex Burns noted of the poll on Friday, Biden's support draws overwhelmingly from older voters. Among Iowa adults over the age of 65, Biden is the clear front-runner. But among voters under the age of 45, Biden holds only 2 percent of the vote.
Klobuchar, Harris and Andrew Yang all hover just below 5 percent in the Iowa caucus poll. Former Texas Congressman Beto O'Rourke, who dropped out of the race this week, struggled to gather more than 2 percent of support in the Harvard CAPS/Harris poll.
The Harvard CAPS/Harris survey gathered responses from 1,810 nationally registered voters.
Senator Bernie Sanders, former vice president Joe Biden, Senator Elizabeth Warren and South Bend Mayor Pete Buttigieg are introduced before the Democratic Presidential Debate at Otterbein University on October 15 in Westerville, Ohio.
