Biden leads Sanders by 24 points in new poll

Former Vice President Joe BidenJoe BidenAre Democrats turning Trump-like? Volatile presidential polls spark new round of anxieties British Bookmaker: Warren has replaced Biden as Democratic primary favorite MORE has seen a surge of Democratic support in the days since he announced his 2020 presidential campaign and now sits comfortably at the top of a new survey of the race.

In the CNN–SRSS poll released early Tuesday, Biden is supported by 39 percent of the Democratic electorate, leading his nearest challenger, Sen. Bernie SandersBernie SandersVolatile presidential polls spark new round of anxieties GOP memo deflects some gun questions to 'violence from the left' British Bookmaker: Warren has replaced Biden as Democratic primary favorite MORE (I-Vt.), by 24 points. Biden and Sanders were the only candidates registering double-digit levels of support in the survey.

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The poll shows an 11-point surge for Biden since last month, when 28 percent of Democrats said they would support him in the primary.

Sanders is now supported by 15 percent of Democratic voters, according to the poll, which found Sen. Elizabeth WarrenElizabeth Ann WarrenAre Democrats turning Trump-like? Manufacturing shrinks, raising questions for Trump Volatile presidential polls spark new round of anxieties MORE (D-Mass.) at 8 percent support and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegVolatile presidential polls spark new round of anxieties British Bookmaker: Warren has replaced Biden as Democratic primary favorite The Hill's Campaign Report: Battle for Senate begins to take shape MORE (D) with 7 percent.

Biden leads Sanders among all the major demographics, according to CNN.

Just 36 percent of Democratic votes say, however, that they are locked in to their choice for president. Biden wins the support of 50 percent of Democrats who say they have made up their minds so far, according to the poll.

The CNN–SRSS poll was conducted from April 25 to 28, and the margin of error is 5.9 percentage points for Democratic-leaning voters.

A Morning Consult survey also published early Tuesday found the vice president with the support of 36 percent of Democrats compared to 22 percent for Sanders, a 6-point surge since Biden's campaign announcement last Thursday

The Morning Consult survey, which contacted only Democratic-leaning voters, surveyed 15,475 voters with a margin of error of just 1 percentage point.