Sen. Elizabeth Warren (D-Massachusetts) continued to gain traction in her 2020 presidential campaign by slightly edging Joe Biden in a new Iowa poll.

A Des Moines Register/CNN/Mediacom survey published Saturday shows the progressive Massachusetts Democrat beating the centrist former vice president by 2 points (22 to 20 percent). The poll also places Sen. Bernie Sanders (I-Vermont) at third with 11 percent support and South Bend, Indiana Mayor Pete Buttigieg at fourth with 9 percent backing. Warren has seen a 7-point bump in support from June, while Biden has witnessed a 3-percent drop in backing since then.

The survey follows another poll published by Focus on Rural America earlier this month that placed Biden and Warren in a virtual tie in Iowa — where the caucuses that kick off the primary election season are held — with 25 and 23 percent support, respectively. Warren has invested large amounts of campaign money into Iowa.

The Des Moines Register survey also found 20 percent of likely Democratic voters said they have decided who their first-choice candidate for 2020 is, while 63 percent of likely caucus-goers stated they could change their mind about the contender they support.

It’s also telling that a higher proportion of Biden supporters (26 percent) than Warren fans (12 percent) say they have made a definite choice about who they would back during the primaries.

Warren is also benefiting from significantly more excited voters in Iowa than Biden, according to the new poll. The survey shows 32 percent of the Massachusetts senator’s supporters describe themselves as “extremely enthusiastic” about caucusing for her, while 22 percent of Biden fans said the same about the former vice president.

The latest poll also reveals Warren is the top-choice candidate for younger Americans. In total, 27 percent of likely caucus-goers under the age of 35 voiced their support for the Massachusetts Democrat, while Biden received 22 percent backing in that same category and Biden drew 9 percent support.

The Des Moines Register poll was conducted September 14-18 among 602 likely caucus-goers. The margin of error is plus or minus 4 percent.