Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) laughed when asked about 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’s prediction that the Democratic primary is a two-person race between him and Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.), calling his comments "naive."

"Well, I think ... that it’s naive for him to think that at this point, that the fate of this election has been determined," she said on CBS's "Face the Nation." "Just look at history. You might need to review to know that what’s happening right now is not necessarily determinative of the outcome."

.@edokeefe reports on the latest in the #2020 race directly from the Caucus state and takes a closer look at @KamalaHarris ' ground game in Iowa. She tells O'Keefe she's "all in" pic.twitter.com/pRRFxHhGXB — Face The Nation (@FaceTheNation) November 3, 2019

Harris’s comments come after Buttigieg told John Heilemann that the race is shaping up to be a "two-way" between him and Warren an interview scheduled to air on Showtime Sunday.

“I think this is getting to be a two-way,” Buttigieg said. “It’s early to say. I’m not saying it is a two-way.”

Buttigieg responded to Harris's comments Sunday by telling The New York Times that "she's right," adding that the Iowa caucuses "are just the beginning."

On remarks Kamala Harris made to CBS calling his comments on a "two-way race" "naive", Pete Buttigieg tells @AsteadWesley, "She's right. Look, where we are now is three months ahead of the Iowa primary, and the, or the Iowa Caucuses, and the Iowa Caucuses are just the beginning." pic.twitter.com/CKWxc5yT8t — DJ Judd (@DJJudd) November 3, 2019

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The Harris campaign has gone "all in" in Iowa, Harris told "Face The Nation," after

eliminating staff in New Hampshire

An Washington Post-ABC News poll released Sunday showed Biden topping the candidates with 28 percent support, followed by Warren, Sanders and Buttigieg. A new Fox News poll had the top four candidates ranked the same way.

Harris received 2 percent support in the Post-ABC poll and 3 percent in the Fox News poll.