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 leads the field of Democrats running for the 2020 presidential nomination in Pennsylvania, according to a new poll released Friday.

In the Emerson College survey, Biden leads in the state he was born in by 19 points with the support of 39 percent of voters, despite not having yet announced a bid for the presidency.

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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.) is in second place in the poll, with the support of 20 percent of Pennsylvania voters, while 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.) holds third place, with 11 percent.

In fourth place is South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegButtigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield Facebook takes down Chinese network targeting Philippines, Southeast Asia and the US MORE (D) with 6 percent. Buttigieg has surged recently in several polls.

Sanders leads Biden in voters ages 18-29 and trails the former vice president among older voters, according to the poll.

Emerson College pollsters said that both Sanders and Buttigieg have shown consistent strength in polls this year, but noted that the two had a long way to go if Biden announces a bid for the White House.

“Sanders in this years [sic] state polling is consistently keeping between 35 percent to 60 percent of his vote from 2016, suggesting he has a strong base of supporters to work with," poll director Spencer Kimball said.

"Mayor Pete has performed well for our third poll in a row, indicating an increase in support for the South Bend Mayor, though Pennsylvania looks like it could be a Joe Biden firewall,” he added.

Emerson College's poll surveyed 808 registered voters in Pennsylvania from March 26 to 28, and the margin of error for the sample of Democratic voters is plus or minus 5.1 percentage points.