| Conservativism | Factor 1 | Factor 2 | Uniqueness |
| Chamber Ideology [t − 1] | .961 | −.082 | .047 |
| Avg. Committee Ideology [t − 1] | .951 | −.036 | .084 |
| Foreign Relations Ideology [t − 1] | .865 | .068 | .264 |
| Presidential Support | |||
| President’s Party (%) | −.124 | .928 | .091 |
| President Party Power [t − 1] | −.053 | .964 | .054 |
| Presidential Batting Average [t − 1] | .173 | .809 | .355 |