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Parties > Parties Overview

Congress at a Glance:

× How to Read Chart: This chart shows the ideologies of major parties in Congress throughout history according to DW-Nominate. Each line represents the median (mid-point) ideology of members of a single party. A lower line means a more liberal party, while a higher line means a more conservative party. The grey line shows the median across all parties in Congress at a given point. As control of Congress changes hands after elections, large swings in the median ideology are visible. The pale dots in the background show the range of ideologies within a party. Move your mouse over party lines for more details, click a line to explore a single party.

Parties Throughout History