Vicky Chuqiao Yang, Northwestern University: “This is a interactive visualization I made of the congress members’ ideology positions, reduced to 2 dimensions, using the DW-NOMINATE method. This visualiztaion is developed as part of the IDEAS Focus Summer School on Data Visualization at Northwestern University. How to use this visulaization:

• Each circle represents a congress member
• The colors represent party membership
• Hover mouse over a circle to see name and state of the congress member.
• Use the slider bar to scroll over years…” [h/t Anne Zald]