Political fundraising

Democratic presidential candidate Bernie Sanders arrives on stage to speak during the Iowa Democratic Party's Hall of Fame Celebration, Sunday, June 9, 2019, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall)

Democratic presidential candidate Kamala Harris speaks during the Iowa Democratic Party's Hall of Fame Celebration, Sunday, June 9, 2019, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall)

Democratic presidential candidate Pete Buttigieg speaks during the African American Leadership Summit Thursday, June 6, 2019, in Atlanta. (AP Photo/John Bazemore)

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., waves before speaking during the 2019 California Democratic Party State Organizing Convention in San Francisco, Saturday, June 1, 2019. (AP Photo/Jeff Chiu)

In this May 13, 2019, photo, former vice president and Democratic presidential candidate Joe Biden interacts with a supporter during a campaign stop at the Community Oven restaurant in Hampton, N.H. North Korea has labeled Biden a "fool of low IQ" and an "imbecile bereft of elementary quality as a human being" after the Democratic presidential hopeful during a recent speech called North Korean leader Kim Jong Un a tyrant. (AP Photo/Michael Dwyer, File)

In this April 3, 2019, photo, Tom Perez, chairman of the Democratic National Committee, speaks during the National Action Network Convention in New York. The Democratic National Committee is upping the ante for its second round of presidential primary debates, doubling the polling and grassroots fundraising requirements from its initial summer debates. The parameters, announced Wednesday, May 29, 2019, are likely to help cull a crop of nearly two dozen candidates and, in the process, intensify scrutiny on Democratic Chairman Perez and his pledge to give all candidates a chance to be heard. (AP Photo/Seth Wenig)

FILE - In this Feb. 2, 2019 file photo, Virginia Gov. Ralph Northam, left, gestures as his wife, Pam, listens during a news conference in the Governors Mansion at the Capitol in Richmond, Va. A law firm has completed its investigation into how a racist photo appeared on a yearbook page for Northam. Eastern Virginia Medical School said in a statement Tuesday, May 21 that the findings of the investigation will be announced at a press conference on Wednesday, May 22. Northam's profile in the 1984 yearbook includes a photo of a man in blackface standing next to someone in Ku Klux Klan clothing. Northam denies being in the photo, which nearly ended his political career in February. (AP Photo/Steve Helber, File)

FILE - In this May 16, 2019, file photo, Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., addresses a campaign rally at George Mason University in Fairfax, Va. Democrats running for the White House rail against the flood of campaign cash that courses through the political system. But it’s becoming clear that those pledges often come with asterisks. Warren has vowed no untraceable “dark money” will help her, despite being backed by an organization that doesn’t disclose some of its donors.(AP Photo/Cliff Owen, File)

House Oversight and Reform National Security subcommittee member Rep. Justin Amash, R-Mich., looks out from the dais on Capitol Hill in Washington, Wednesday, May 22, 2019, during the House Oversight and Reform National Security subcommittee hearing on "Securing U.S. Election Infrastructure and Protecting Political Discourse." (AP Photo/Carolyn Kaster)

FILE - This Oct. 24, 2016, file photo shows dollar bills in New York. Almost the entire 2020 Democratic presidential field has joined the labor movement driven by fast food workers to implement a federal minimum wage of $15. (AP Photo/Mark Lennihan, File)