Spend a week eating brunch and carousing nighttime haunts in our nation's capital, and it becomes clear that money greases the wheels of governance. What's less obvious, however, is exactly where the money comes from.

Using data from the Center for Responsive Politics, the following presentation reveals one of the largest sources, Citigroup (NYSE:C), which is the fourth biggest corporate contributor in the country.

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John Maxfield has no position in any stocks mentioned. The Motley Fool owns shares of Citigroup. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.