Poll: Almost two-thirds of Dems say they could change their mind on 2020 candidates

Poll: Almost two-thirds of Dems say they could change their mind on 2020 candidates
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Nearly two-thirds of Democratic voters said they would be open to changing their minds about who they support in the party's 2020 primaries, according to a new poll. 

In a CNN survey released Tuesday, 64 percent of Democrats and likely Democrats who had selected a favorite presidential candidate said it is possible they might change their mind. Thirty-six percent said they "definitely support" their top choice.

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When asked which candidates they wanted to learn more about, Sen. Kamala HarrisKamala Devi HarrisHarris bashes Kavanaugh's 'sham' nomination process, calls for his impeachment after sexual misconduct allegation Gun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' MORE (D-Calif.) topped the list, with 23 percent of respondents putting her in the top three candidates they were most curious about. She was followed by Sen. Elizabeth WarrenElizabeth Ann WarrenGun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' Democrats spar over electoral appeal of 'Medicare for All' MORE (D-Mass.), with 20 percent, and former Vice President Joe BidenJoe BidenBiden bemoans white supremacy in remarks at civil rights movement site Gun control: Campaigning vs. legislating Sunday shows - Guns dominate after Democratic debate MORE (D) at 19 percent.

The poll was conducted April 25-28. Among the 1,007 respondents, 411 were Democrats or Democratic-leaning independents who are registered to vote and 367 said they had already chosen a candidate to support in the party's 2020 primary.

The survey has a margin of error of plus or minus 3.8 percentage points.

The field of 2020 field has grown to 21 Democratic presidential candidates. Biden has consistently led the field, and a new poll puts him 24 points ahead of his nearest challenger, Sen. Bernie SandersBernie SandersGun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' Sunday shows preview: Democratic candidates make the rounds after debate MORE (I-Vt.).

South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegO'Rourke responds to Buttigieg's gun criticism: 'That calculation and fear is what got us here in the first place' Buttigieg: Biden gave 'bad' debate answer on slavery's legacy O'Rourke's debate moment reignites gun debate on Sunday shows MORE (D) has seen a rise in popularity in recent weeks, often polling in third place, while Harris, who was once considered a front-runner has been falling recently.

Warren has seen an uptick in recent days.