Members of Congress trading votes to pass legislation of interest to each other is called Logrolling.

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Logrolling refers to the practice of members of Congress trading votes in order to pass legislation that benefits each other, regardless of whether the legislation benefits their constituents or the country as a whole. This is a common practice in Congress, but it is often criticized as being corrupt and putting special interests ahead of the public good.

Members of Congress Trading Votes to Pass Legislation of Interest