International Association of Fire Fighters (IAFF) (announced Apr. 29, 2019)

133 former national security officials (announced Nov. 12, 2019)
National Association of Government Employees (NAGE-SEIU) (announced Dec. 9, 2019)

Actors Vivica A. Fox and Sean Patrick Thomas (announced Jan. 9, 2020)
AAPI Victory Fund (announced Jan. 17, 2020)
International Association of Bridge, Structural, and Ornamental Iron Workers (announced Jan. 22, 2020)

Amalgamated Transit Union (ATU) (announced Feb. 1, 2020)
International Brotherhood of Electrical Workers (IBEW) (announced Feb. 5, 2020)
Latino Victory Fund (announced Feb. 20, 2020)

Operative Plasterers’ & Cement Masons’ International Association (OPCMIA) (announced Mar. 3, 2020)
International Association of Machinists and Aerospace Workers (announced Mar. 8, 2020)
Brady PAC (announced Mar. 8, 2020)
Everytown for Gun Safety Action Fund (announced Mar. 9, 2020)

Giffords PAC (announced Mar. 11, 2020)
National Wildlife Federation Action Fund (announced Mar. 12, 2020)
National Education Association (NEA) (announced Mar. 14, 2020)

International Longshoremen's Association (ILA) (announced Mar. 15, 2020)
more than 80 nation security professionals (announced Mar. 18, 2020)

CHC BOLD PAC (announced Mar. 20, 2020)

United Food and Commercial Workers (UFCW) (announced Mar. 20, 2020)
American Federation of Teachers (AFT) (announced Mar. 22, 2020)
American Federation of State County and Municipal Employees (AFSCME) (announced Mar. 23, 2020)

CASA in Action (announced Apr. 9, 2020)
Emgage PAC (announced Apr. 16, 2020)
Voto Latino (announced Apr. 16, 2020)
End Citizens United and Let America Vote (announced Apr. 16, 2020)
J Street (announced Apr. 17, 2020)
League of Conservation Voters Action Fund (announced Apr. 20, 2020)
Congressional Black Caucus PAC (announced Apr. 20, 2020)

more than 80 scientists (announced Apr. 21, 2020)
United Auto Workers (UAW) (announced Apr. 21, 2020)
Jewish Democratic Council of America (announced Apr. 24, 2020)

Indivisible (announced May 4, 2020)
National Center for Transgender Equality Action Fund (announced May 5, 2020)
Human Rights Campaign (announced May 6, 2020)

Progressive Turnout Project (announced May 6, 2020)
Transport Workers Union (TWU) (announced May 7, 2020)
International Longshore and Warehouse Union (ILWU) (announced May 11, 2020)
International Federation of Professional and Technical Engineers (IFPTE) (announced May 15, 2020)

Equality PAC (announced May 17, 2020)
International Alliance of Theatrical Stage Employees (IATSE) (announced May 19, 2020)
United Steelworkers (USW) (announced May 20, 2020)
Communications Workers of America (CWA) (announced  May 22, 2020)
AFL-CIO (announced May 26, 2020)
Transportation Trades Department, AFL-CIO (announced May 27, 2020)
Coalition of Black Trade Unionists (announced May 28, 2020)

American Postal Workers Union (APWU) (announced June 9, 2020)
Bakery, Confectionery, Tobacco Workers, and Grain Millers International Union (BCTGM) (announced June 10, 2020)
Planned Parenthood Action Fund (announced June 15, 2020)

United Farm Workers (announced June 24, 2020)
NRDC Action Fund (announced June 24, 2020)

Pride at Work (announced June 24, 2020)
All 23 Democratic Attorneys General (announced June 25, 2020)
International Union of Painters and Allied Trades (announced June 26, 2020)

MoveOn (announced July 1, 2020)

International Organization of Masters, Mates & Pilots (MM&P), Marine Engineers' Beneficial Association (MEBA) (announced July 1, 2020)

Brotherhood of Railway Signalmen (announced July 1, 2020)
International Association of Sheet Metal, Air, Rail, and Transportation Workers (announced July 1, 2020)
43 Alumni for Biden (announced July 1, 2020) [Bush alumni]
International Union of Bricklayers and Allied Craftworkers (BAC) (announced July 2, 2020)
Service Employees International Union (SEIU) (announced July 9, 2020)

National Treasury Employees Union (NTEU) (announced July 20, 2020)

American Federation of Government Employees (AFGE) (announced July 21, 2020)
National Weather Service Employees Organization (NWSEO) (announced July 24, 2020)
NARAL Pro-Choice America (announced July 27, 2020)
Democratic Treasurers Association (announced July 28, 2020)

Council for a Livable World (announced Aug. 6, 2020)
Congressional Democratic Women's Caucus (announced Aug. 7, 2020)
Sierra Club (announced Aug. 10, 2020)
Bend the Arc Jewish Action PAC (announced Aug. 13, 2020)
Supermajority (announced Aug. 13, 2020)
Alliance for Retired Americans (announced Aug. 13, 2020)

Working Families Party (announced Aug. 13, 2020)
National Association of Letter Carriers (NALC) (announced Aug. 14, 2020)

United Association of Union Plumbers and Pipefitters announced Aug. 17, 2020)
International Brotherhood of Teamsters (announced Aug. 18, 2020)
International Heat and Frost Insulators and Allied Workers (announced Aug. 20, 2020)

BlueGreen Alliance (announced Aug. 26, 2020)

National LGBT Chamber of Commerce (announced Aug. 31, 2020)

Office and Professional Employees International Union (OPEIU) (announced Aug. 31, 2020)

Romney 2012 Alumni (announced Aug. 27, 2020)
McCain Alumni (announced Aug. 27, 2020)

Community Change Voters/Community Change Action (announced Sept. 21, 2020)
Paid Leave for the U.S. Action Fund (PL+US Action) (announced Sept. 24, 2020)
National Committee to Preserve Social Security and Medicare (announced Sept. 24, 2020)
U.S. Women's Chamber of Commerce (announced Sept. 25, 2020)
International Union of Operating Engineers (IUOE) (announced Sept. 30, 2020)
United Brotherhood of Carpenters and Joiners of America (UBC) (announced Sept. 30, 2020)

North America Building Trades Unions (NABTU) (announced Oct. 23, 2020)

Association of Flight Attendants Union and Association of Professional Flight Attendants (announced Oct. 28, 2020)