Northern Democrats and Party Polarization in the U.S. House.

This article reports on the issue of differences in party voting in the U.S. House. Differences in party voting are on the rise in the U.S. House, with the increase generally regarded as beginning somewhere in the 1970's. Polarization may be measured as the percentage of party votes and party cohesion. Regardless of the measurement, polarization between the parties in the House is increasing. After the 1970's, Democrats have become more liberal and Republicans somewhat more conservative, resulting in a growing difference between the two parties across the 1980's and 1990's.