Sen. Elizabeth Warren (D-Mass.) appears to have gained some momentum in the race for the party’s nomination after last week’s series of events in Iowa.

An Economis/Yougov poll, released Friday morning, Aug. 16, shows Warren running neck and neck with former Vice President Joe Biden, and having pulled several points ahead of Vermont Sen. Bernie Sanders. The poll shows Biden with a slim lead (21%), followed by Warren (20%), Sanders (16%), and California Sen. Kamala Harris (8%).

Mayor of South Bend, Indiana, Pete Buttigieg (5%), Texas Rep. Beto O’Rourke (5%), New Jersey Sen. Cory Booker (2%), and Hawaii Rep. Tulsi Gabbard (2%) round out the top eight in the poll.

Gabbard, by receiving at least 2% support in her second consecutive poll, is inching closer to qualifying for September’s third round of debates in Houston, next month. She needs to equal her latest showing in two more sanctioned polls to qualify.

Biden is still seen by most Democrats as the senior statesman among candidates, as well as the most likely to appeal to independent voters. However the former vice president has suffered from a series of political miscues during public appearances in the past several weeks, repeatedly mixing his words or failing to complete sentences.

Biden’s gaffes have become frequent enough to raise questions among Democrats about whether he is a strong enough candidate to go toe to toe with President Trump a year from now.

To date, Warren has shown a level of energy and conviction in her candidacy that other candidates seem to lack. However, the question with Warren is whether her left-leaning views and aggressively liberal social programs, which include decriminalizing migrant border crossings, student loan forgiveness, and universal health care, will be tenable in a general election. Surveys taken within the Democratic Party identify Warren to be at least as far left as the self-proclaimed “democratic-socialist” Sanders.

The 2020 election may very well come down to voters’ view of the economy, above all else. If Warren wins the nomination, there may be concerns over whether her tax-driven policies might be disruptive to economic progress, or whether there’s any hope that such proposals could gain traction in a likely Republican-controlled Senate.

The Economis/Yougov poll was conducted August 10-13 with a sample of 1,500 adults