By Daniel Schuman and Alisha Green One of the foundations of democracy is a legislature that functions well. The ability to assess whether a legislature is functioning properly depends on the public's ability to see what it is doing. Observing what the U.S. Senate is doing, unfortunately, is a difficult task, and one that is unnecessarily hard. Have special interests become increasingly powerful in the Senate because the upper chamber has diminished its capacity to legislate? To evaluate this question, we gathered data about congressional staff numbers, pay, and retention from a number of difficult-to-access (and often non-public) sources. While the U.S. Senate is often seen as the wiser and more seasoned counterpart to the House, we believe it is suffering from the same affliction that has robbed the lower chamber of some of its ability to engage in reasoned decision making, placing it at the mercy of special interests. Over the past thirty years, the Senate weakened its institutional knowledge base and diminished its capacity to understand current events through a dramatic reduction of one of its most valuable resources: experienced staff.