1998 was the last year that Gingrich, Paul and Santorum were all in Congress, and the Gingrich’s annual and lifetime ACU ratings were far better than both of the others:
100% - Gingrich: Annual 1998 ACU Rating (90% Lifetime Rating as of 1998)
88% - Paul: Annual 1998 ACU Rating (19% Lifetime Rating as of 1998)
84% - Santorum: Annual 1998 ACU Rating (83% Lifetime Rating as of 1998)
1997: Gingrich rating 75