DES MOINES, Iowa (AP) — It’s certainly not an unwelcome challenge for advocates for gender equality that four or more women are running for the Democratic nomination for president in 2020.

To many activists, that means a field more reflective of a party that counts women as a crucial voting bloc.

But the prospect of multiple women in the race also presents obstacles, with no single candidate holding a claim to women’s votes to the degree Hillary Clinton did in 2016. The women’s vote, and groups that provide financial and grassroots support, could split.

Looming over it all is persistent gender bias and the question of whether Americans are ready to elect a female president.

“We do realize there’s still sexism in this country, and what we’re trying to do is change minds. I think this country is more than ready for this to happen, I really do,” said EMILY’s List President Stephanie Schriock, whose group aids the campaigns of Democratic women supporting abortion rights. “But that doesn’t make it easy.”

For now, many women are basking in the success of the November elections that sent a historically diverse class to Congress. Crowds gathering in cities nationwide Saturday for events tied to the third annual Women’s March.

In the early days of the Democratic primary, leaders of many advocacy organizations are thrilled that so many women are seeking the presidency, but are not to back any particular candidate.

EMILY’s List, which spent $37 million on House races in 2018 and was a pivotal Clinton ally, is “not currently endorsing any candidate for the Democratic nomination for president” in 2020, Schriock said. She demurred when asked if that strategy would change.

A wait-and-see approach works for now, but groups that actively bolster female candidates could face pressure to align with specific campaigns as the primary goes on.

Deirdre Schifeling, executive director of the Planned Parenthood Action Fund, said only that the group’s estimated 12 million backers are dedicated to defeating President Donald Trump and that she looks forward to working with “all candidates” in the primary.

NARAL Pro-Choice America’s president, Ilyse Hogue, said the abortion rights group has made no firm decision about whether to eventually back one or more Democratic hopefuls and that “we see it as a plus, not a minus, if we haven’t endorsed by the Iowa caucus” because it means that members see multiple candidates supporting their goals.

Massachusetts Sen. Elizabeth Warren last month became the first woman to launch a presidential exploratory effort, joined shortly afterward by New York Sen. Kirsten Gillibrand and Hawaii Rep. Tulsi Gabbard. Sens. Kamala Harris of California and Amy Klobuchar of Minnesota also are considering running.

Among that top tier of female candidates, Gillibrand is particularly vocal in invoking her gender as a driver of her campaign. She put women’s priorities and perspective at the forefront of her launch this week. She pledged to fight for children and highlighted her work on behalf of sexual misconduct victims.

Gillibrand was one of the few prominent 2020 Democrats who attended a Women’s March event this year amid anti-Semitism charges that have plagued the event’s national leadership team. But the senator said the controversy wouldn’t disrupt her commitment to the march’s broader mission.

Gillibrand also praised Iowa voters for sending two women represent the state in Congress. “This is what changing the face of leadership looks like,” she said.

“The truth is if we change who’s at the decision-making table, we change everything. Now is our time to reclaim our power. Now is our time to raise our voices,” she told activists gathered at Iowa’s Capitol.

Warren’s campaign has so far emphasized racial and economic inequity more than gender. Pundits are already speculating about her and Gillibrand’s “likability” – a reminder, for some influential women, of the uneven playing field that Clinton faced challenging Trump.

Democratic Sen. Mazie Hirono of Hawaii recalled “all kinds of strange attitudes that come out” when women seek executive office and called for “more attention paid” to gender bias given the historic success of female candidates in 2018.

The presence of several women in the presidential field, activists and analysts say, hopefully can make it easier to identify and address sexism.

“Because there are so many women running, it doesn’t totally inoculate women from sexism, but it does provide some guardrails,” said Shaunna Thomas, executive director of Ultraviolet, a group advocating for gender equality throughout American life.

Kelly Dittmar, a scholar at the Center for American Women and Politics at Rutgers University, said, “The fact that we’re willing to call it out, that’s where the progress is. We have to just be realistic that racism and sexism within our institutions are really deep-seated.”

Cecile Richards, who led Planned Parenthood for 12 years, predicted that the high-profile female Democratic candidates would push their male counterparts to work harder to appeal to female voters.

“What do the men who are running for office have to offer women?” Richards asked. “Right now, women have a lot of candidates they can look at who look a lot more like them, who have been on the front lines of their issues for a long, long time.”