Database of United States Congressional Historical Statistics, 1789-1989

The Database of US Congressional Historical Statistics, 1789-1989 compiles the complete roll call voting records of members of Congress compiled from the Congressional Record.

Women in Parliament, 1945-2003: Cross-National Dataset

The Women in Parliament data provides information on women’s inclusion in parliamentary bodies in over 150 countries from 1945 to 2003. The dataset allows for extensive, large-scale, cross-national investigation of the factors that explain women’s attainment of political power over time and provides educators with comprehensive international and historical information on women in a variety of political positions. Information is provided on female suffrage, the first female member of parliament, yearly percentages of women in parliaments, when women reached important representational milestones, such as 10 percent, 20 percent, and 30 percent of a legislature, and when women achieved highly-visible political positions, such as prime minister, president, or head of parliament.

Party Strength in the United States: 1872-1996

Party Strength in the United States: 1872-1996 provides measures of political party strength at the state level.
“The file consists of statewide percentages of the actual vote won by Democratic, Republican, and other candidates/parties for the offices of president, governor, United States House of Representatives, and, beginning in 1914, the two Senate seats allocated to each state.”
 http://www.icpsr.umich.edu/cocoon/ICPSR/STUDY/06895.xml