I'm interested in finding the most up-to-date latitude and longitude data for U.S. Congressional district borders. I'd prefer a human readable format (e.g. XML), but I'm writing my own code so I can work with just about anything if the format is well-defined. I only need the state, district, and the latitude and longitude points that define the borders for each district.
I need the borders for all U.S. Congressional districts. Is this a dataset that I can download from somewhere all in one place? Or do I need to track down the data for each state individually? (Or even worse, each district?)