The data is actually from GovTrack.us, which I suspect is also where DW-NOMINATE gets it. My script for querying GovTrack is on Github: https://github.com/David

The data is actually from GovTrack.us, which I suspect is also where DW-NOMINATE gets it. My script for querying GovTrack is on Github: https://github.com/DavidChouinard/congressviz https://github.com/DavidChouinard/congressviz