Four Democratic senators are looking to get early starts on what is expected to be a crowded 2020 presidential field, The New York Times noted on Saturday

The four, Sen.Kamala Harris of California, Sen. Elizabeth Warren of Massachusetts, Sen. Cory Booker of New Jersey and Sen. Kirsten Gillibrand of New York all have something in common: They are not the typical white, male candidate.

All have been spending recent weeks getting things in order, according to the Times, and are expected to take more formal steps as the new year begins.

While bigger names such former Vice President Joe Biden and Vermont Sen. Bernie Sanders, who was a popular challenger to eventual nominee Hillary Clinton in 2016, are naturals to watch, so are newcomers such as Rep. Beto O'Rourke of Texas, who narrowly lost a Senate challenge to Republican Ted Cruz in November.

Though O'Rourke can't shake the white male mantle, he is thought to be considering a female campaign manager.

Diversity among staff appears to be a important among Democrats, though Gillibrand appears set to name a man to run her campaign, the Times notes.

"You have to have a diverse leadership team, and that, more than anything, is something that these campaigns have to be paying attention to," Democratic operative Anne Caprara told the Times. "When it comes to women and women of color, so many of them are going to want to see that the candidate is not just hiring women but really paying attention to them when they're giving advice."