Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) leads former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE in Iowa and New Hampshire, but South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE has surged into contention in the Hawkeye State, according to a new poll.

The latest Firehouse Strategies-Optimus survey finds Warren with a narrow lead in Iowa at 25 percent support, followed by Biden at 22 percent and Buttigieg at 17 percent. Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.), who has been recovering from a heart attack, is in fourth place at 5 percent in Iowa.

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Buttigieg is the biggest mover in the Iowa poll, gaining about 9 points.

Warren’s lead is larger in New Hampshire, where she registers 25 percent support, followed by Biden at 18 percent and Sanders at 9 percent.

Still, Biden leads big in South Carolina, where black voters make up more than half of the Democratic primary electorate. Biden comes in at 32 percent, compared to 16 percent for Warren and 8 percent for Sanders.

Support for impeachment among Democrats in the early-voting states has skyrocketed in recent weeks, and stands at 79 percent in Iowa, 75 percent in New Hampshire and 72 percent in South Carolina, notching double-digit gains in all three states.

In addition, a slim majority of Democrats in all three states believe that President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE should be imprisoned, as well as impeached.

The Firehouse-Optimus survey of 1,765 likely Democratic primary voters was conducted Oct. 8-10 and has a margin of error of 3.6 percentage points in each state.