In The New Leviathan: How the Left-Wing Money Machine Shapes American Politics and Threatens America’s Future (New York: Crown Forum, 2012), authors David Horowitz and Jacob Laksin “describe five critical areas of public policy . . . where the network of left-wing funders and activists has moved radical agendas and ideas from the political margins to the political mainstream and made them the official policies of the Democratic Party”: immigration, national security, healthcare, environment, and government unions. Data about the foundations discussed in the book can be found at DiscovertheNetworks.org (17), which, unfortunately, is misspelled in the book.
If you haven’t read David Horowitz and Richard Poe’s The Shadow Party: How George Soros, Hillary Clinton, and Sixties Radicals Seized Control of the Democratic Party (Nashville: Nelson Current, 2006), you should.