Lindsey, like his mentor McQueeg proves that ACU ratings are not the be all and end all. Graham's lifetime rating is an 89.79. (McNuts is also an artificially high 81.43)
Those ratings are rigged. The members are notified what technical bills will be scored and what is a “free vote”. Liberals like McPain and Graham know how to vote “right” when it counts on their score. I don’t think they were rigged in the 1960s and 1970s though.