Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) and former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE are the top choices among Democratic voters, with former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) getting a bump after announcing his White House bid, according to a new Emerson poll.

Sanders and Biden each garnered 26 percent in the survey conducted March 17-18, a 9-point bump for Sanders since the February poll and after his official campaign announcement.

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Sen. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) followed with 12 percent, and O'Rourke had 11 percent, with Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) rounding out the top five at 8 percent. O’Rourke’s support is also up from February, increasing 7 points.

Sanders leads among both 18- to 29-year-olds, with 42 percent, and among 30- to 49-year-olds, with 30 percent support. Biden, meanwhile, leads among respondents 50 to 64 years old, with 39 percent and among those 65 or older, with 33 percent.

Biden is the favorite among respondents who supported 2016 Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE, with 36 percent, while Harris and Sanders are tied for second at 13 percent, followed by O’Rourke at 12 percent and Warren at 8 percent.

Forty-one percent of Sanders’s 2016 primary supporters in the poll back him, while 18 percent support Biden, 11 percent prefer Harris, 10 percent support Warren and 9 percent back O’Rourke.

The poll was based on interviews with 487 respondents and has a margin of error of 4.4 percentage points.