In this May 16, 2019, photo, Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., addresses a campaign rally at George Mason University in Fairfax, Va. Warren is gaining traction with black women debating which Democratic presidential candidate to back in a historically diverse primary. (AP Photo/Cliff Owen)
The crowded field of 2020 Democratic presidential candidates is showing early signs of money trouble as donors sit on the sidelines
Democratic presidential candidate Sen. Cory Booker, D-N.J. talks to the crowd during a hometown kickoff for his national presidential campaign tour at Military Park in downtown Newark, Saturday, April 13, 2019.
(AP Photo/Andres Kudacki)