Poll: Warren leads Biden in Iowa, New Hampshire

Sen. Elizabeth WarrenElizabeth Ann WarrenTrump calls Warren 'Pocahontas,' knocks wealth tax Warren, Buttigieg fight echoes 2004 campaign, serves as warning for 2020 race Democrats battle for Hollywood's cash MORE (D-Mass.) leads former Vice President Joe BidenJoe BidenPence: It's not a "foregone conclusion" that lawmakers impeach Trump Warren, Buttigieg fight echoes 2004 campaign, serves as warning for 2020 race Trump: Giuliani to deliver report on Ukraine trip to Congress, Barr MORE in Iowa and New Hampshire, but South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegWarren, Buttigieg fight echoes 2004 campaign, serves as warning for 2020 race Chicago Mayor Lightfoot to Buttigieg: 'Break that NDA' to have 'moral authority' against Trump Sanders, Omar to hit campaign trail in New Hampshire 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 SandersBernie SandersWarren, Buttigieg fight echoes 2004 campaign, serves as warning for 2020 race Democrats battle for Hollywood's cash Sanders, Omar to hit campaign trail in New Hampshire 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 TrumpDonald John TrumpPence: It's not a "foregone conclusion" that lawmakers impeach Trump FBI identifies Pensacola shooter as Saudi Royal Saudi Air Force second lieutenant Trump calls Warren 'Pocahontas,' knocks wealth tax 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.