Poll: Warren leads Biden in Iowa, New Hampshire

Sen. Elizabeth WarrenElizabeth Ann WarrenTensions between McConnell and Schumer run high as trial gains momentum Sanders wants one-on-one fight with Biden Biden, Sanders tax plans would raise less revenue than claimed: studies MORE (D-Mass.) leads former Vice President Joe BidenJoe BidenThe Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' What to watch for on Day 3 of Senate impeachment trial Sanders wants one-on-one fight with Biden MORE in Iowa and New Hampshire, but South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegThe Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' Sanders wants one-on-one fight with Biden Overnight Defense: Trump downplays troops' concussion injuries in Iran attack | Dems offer case against Trump on day two of trial | UN links Saudis to hack of Bezos' phone 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 SandersThe Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' Tensions between McConnell and Schumer run high as trial gains momentum Sanders wants one-on-one fight with Biden 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 TrumpMnuchin knocks Greta Thunberg's activism: Study economics and then 'come back' to us The Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' What to watch for on Day 3 of Senate impeachment trial 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.