Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE leads his closest challenger in the 2020 Democratic presidential field by 7 points in the key battleground state of Pennsylvania, according to a new survey.

The poll from Franklin & Marshall College shows the former vice president with 22 percent support from Democratic voters. Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) follows with 15 percent, and Sen. Elizabeth Warren Elizabeth WarrenGOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (D-Mass.) has 14 percent.

No other Democratic candidate registered double-digit support in Pennsylvania.

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The survey, released Thursday, shows Biden's lead over his competitors diminishing in recent months. Biden held a 16-point lead in July, pollsters noted, and led by 8 percent in October.

Warren currently tops the list of voters' preferred second choices at 26 percent, with Sanders coming behind her at 18 percent.

The survey also shows that roughly 3 in 4 supporters of Sanders and Warren identify themselves as liberals, contrasted by just 4 in 10 Biden supporters.

The survey of 628 registered Pennsylvania voters, including 292 Democrats, 251 Republicans and 85 independents, was conducted from Jan. 20 to 26 with a margin of error of 6.2 percentage points.