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The more conservative the Republican, the more dependent that Republican is likely to be on the nation's biggest individual donors, a new Sunlight Foundation analysis of campaign finance data finds. By "biggest individual donors," we are referring to a group we named “the 1% of the 1%” after the share of the U.S. population that they represent. These wealthy donors may be pulling Republicans to the political right, acting as a force for a more polarized Congress. The polarizing effect for Democrats, meanwhile, is unclear. If anything, more liberal Democrats depend a little less on 1% of the 1% donors than conservative Democrats. As we explored in our big-picture look at the 1% of the 1%, the biggest donors in American politics tend to give big sums of money because they want one party to win. Approximately 85 percent of the top individual donors in U.S. politics contributed at least 90 percent of their money to one party or the other. By contrast, less than four percent of these donors spread their money roughly equally between the two parties (a 60-40 split or less).

Figure 1.

The above figure treats all Democrats and Republicans as equivalent. In reality, both parties contain some moderates and some extremists. Some -- Ezra Klein, most prominently -- have argued that while small money exerts a polarizing tug on the parties, big money is consensus-oriented and centralizing. At the time, I responded that if big money was consensus-oriented, it was doing a terrible job of building consensus. I went further to hypothesize that big money might also be polarizing. Turns out I was more right than I knew then.

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