Massachusetts Sen. Elizabeth Warren, who surged in recent months in the crowded Democratic presidential primary, has seen some support dwindle in recent polling.

Morning Consult’s latest poll, conducted after last Wednesday’s Democratic debate, showed 15% of likely Democratic primary voters would pick Warren as their first choice, a 2% drop from the week prior and her worst showing since August.

The small drop in support comes as South Bend Mayor Pete Buttigieg has risen to take the lead in Iowa caucus polls and as two other candidates threw their hat in the ring, former Massachusetts Gov. Deval Patrick and former New York City Mayor Mike Bloomberg.

Morning Consult’s poll showed support for Warren drop among almost every demographic group surveyed, but especially in highest-educated, older voters and those identifying as “liberal” or “very liberal.” Among those liberal voters, Warren lost a previous edge over Sanders and now trails him by 4 points, 16% to 20%, the poll found.

According to The New York Times, the latest national polling averages show former Vice President Joe Biden still clinging to frontrunner status with 27% compared to Warren’s 22% and Vermont Sen. Bernie Sanders’ 18%. Buttigieg has hovered in fourth place at about 8%, according to the Times’ tracking of national poll averages.

Buttigieg’s support as a top choice among Democratic voters has surged 4 points to 9%, while Biden dropped 2 points but still grabbed the biggest share of first-place support at 30%, according to Morning Consult. Bloomberg and Patrick garnered 2% and 1%, respectively, in first-choice support, the poll showed.