Biden adds 5 points to lead over 2020 Dem field: poll

Former Vice President Joe BidenJoe BidenUkrainian official denies Trump pressured president Trump goes after New York Times, Washington Post: 'They have gone totally CRAZY!!!!' Warren overtakes Biden in Iowa for first time: poll MORE (D) has expanded his comfortable lead over the 2020 Democratic primary field since his presidential campaign announcement last month, according to a new poll.

The Reuters/Ipsos survey released Wednesday found that Biden's support among Democratic voters has increased 5 percentage points, up to 29 percent. 

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He now leads his only close challenger, Sen. Bernie SandersBernie SandersWarren overtakes Biden in Iowa for first time: poll The polls are asking the wrong question Sanders unveils plan to eliminate Americans' medical debt MORE (I-Vt.), by 16 points in the poll. Sanders, at 13 percent, is the only other candidate to register more than 6 percent support among Democratic voters.

Biden trails the Vermont senator among millennial voters, who break for Sanders, 18 percent to 16 percent, over the former vice president, but leads the Vermont senator among all other major demographic groups, according to Reuters.

"[T]here is not a significant anti-Biden bloc of voters split between the other candidates,” Ipsos pollster Chris Jackson said, according to Reuters, adding, “At this moment, Joe Biden is a clear front-runner in the Democratic primary."

Many presidential candidates, including some governors such as Steve BullockSteve BullockIowa Steak Fry to draw record crowds for Democrats The Hill's Campaign Report: De Blasio drops out | Warren gains support from black voters | Sanders retools campaign team | Warning signs for Tillis in NC New poll finds Biden, Warren in virtual tie in Iowa MORE (Mont.) and Jay InsleeJay Robert Inslee2020 Democrats defend climate priorities in MSNBC forum Overnight Energy: Trump officials formally revoke California emissions waiver | EPA's Wheeler dodges questions about targeting San Francisco over homelessness | 2020 Dems duke it out at second climate forum Yang floats nominating Inslee as 'climate czar' MORE (Wash.), were largely unknown by the Democratic electorate, according to the poll, receiving less that 20 percent name recognition among voters.

The Reuters/Ipsos poll was conducted on May 10 and May 13, and contacted 1,132 Democrats and left-leaning independents. Its credibility interval is 3 percentage points.