"As of 2004, an alphabetical list of Shadow Party groups included the following: Air America Radio; America Coming Together; America Votes; American Constitution Society; American Federation of Labor - Congress of Industrial Organizations; American Federation of State, County and Municipal Employees; American Federation of Teachers; Anshell Media; Association of Community Organizations for Reform Now; Association of Trial Lawyers of America; Band of Progressives; Brady Campaign to Prevent Gun Violence; Campaign for a Progressive Future; Campaign for America's Future; Center for American Progress; Clean Water Action; Communication Workers of America; The Constitution Project; DASH PAC; Defenders of Wildlife Action Fund; Democracy for America; Democratic Governors Associations; Democratic Legislative Campaign Committee; Democratic Senatorial Campaign Committee; Dog Eat Dog Films; EMILY's List; Environment 2004; Gore/Lieberman Recount Committee; Hotel Employees & Restaurant Employees International Union; the Human Rights Campaign; INdTV; International Brotherhood of Electrical Workers; Joint Victory Campaign 2004; Laborers International Union of North American; League of Conservation Voters; New Democrat Network; The Media Fund; Media Matters for America; Million Mom March; Moving America Forward; MoveOn.org; Music for America; National Association for the Advancement of Colored People; NARAL Pro-Choice America; National Education Association; National Grassroots Alliance; National Jewish Democratic Council; National Treasury Employees Union; New American Optimists; New Democrat Network; Partnership for America's Families; People for the American Way; Phoenix Group; Planned Parenthood; Pro-Choice Vote; Service Employees International Union; Sheet Metal Workers International Association; Sierra Club; The Thunder Road Group; United Food & Commercial Workers Union; United Progressive Alliance; USAction; Vagina Votes; Voices for Working Families; Vote for Change; Young Voter Alliance; and 21st Century Democrats."
http://www.discoverthenetworks.org/groupProfile.asp?grpid=6706
It looks like you are way ahead of the curve