Johnson got 74%
It provides more data over more years and doesn't have the overly small sample size and somewhat cherry-picked methodology that those Liberty Scores do. Johnson does a lot better with ACU/CPAC than he does with the Liberty Score people.
ALL information is helpful so long as it helps identify the truth -- even ratings from ultra-liberal groups can be helpful when interpreted in reverse of what they intend. :-)
An interested person can compare and decide for himself which is the better measure. Among the single-issue, all-or-nothing types, unfortunately probably LESS information is better because they aren't interested in anything that contradicts their worldview.