MoveOn's primary source of funding is its members. MoveOn.org raised nearly 60 million dollars in 2004 from its members alone, with an average donation of $50.

h/t TPM who noted:

So...Hatch says he gets donations from all sorts of people -- "including liberal people" -- but as for that supposed left-winger George Soros and that "scurrilous" liberal group MoveOn.org -- they've got a kick in the teeth coming.