"Democrats don’t like Citizens United because they think it might blunt their advantages. According to OpenSecrets.org, of the top five organizations — i.e., unions and corporate PACs — that give to federal candidates, all (mostly public unions) give 97 percent to 100 percent of their donations to liberals and Democrats. Of the top 10, eight give almost exclusively to the left. Of the top 25, 18 donate disproportionately to the left.-Jonah Goldberg
By the way, Koch Industries is No. 49 on the list, and the National Rifle Association is No. 74."