Some useful links:
"Coalition Leverage" Website for our CIP Data
Data on Speeches in Japanese Diet
Information on parliamentary sessions of the Japanese Diet
Historical District Boundaries in Japan
Minsuk Kahng's Blog on District Boundaries in Korea
Erik Larsen Gahner's comprehensive list of datasets
Geospatial Data on Japan provided by the National Land Numerical Information Division
.shp-files on Japanese administrative boundaries, 1889-2006
Census Data for Japanese Municipalities
The Japanese Local Elections Dataset