Sen. Elizabeth Warren (Mass.) closed the gap of support between her and former Vice President Joe Biden as the top contender for the presidential nomination in Iowa’s Democratic caucuses, the first state in the country to vote in the race, according to the latest results of a key poll in Iowa released Saturday night.

In the Des Moines Register/CNN/Mediacom poll, Warren was the first-choice candidate with support from 22% of likely Democratic caucus attendees ― up 7 percentage points since the last poll in June. Biden, who has maintained a slight edge over his opponents in other polling, fell 3 percentage points, bringing him to second place with 20% of their support.

According to the Register, support for Biden has fallen in the Iowa polls since last year.

Sen. Bernie Sanders (I-Vt.), who is also running for the Democratic nomination, fell far behind both Warren and Biden in the Saturday’s poll, taking third place at 11% ― down 5 percentage points since June.