Please... you're (once again) pulling percentages out of your thin air.
I was "pulling percentages out of the air" when I suggested that Rudy Giuliani was a conservative on no more than 15% of the issues.
The 20% has some validity to it. If you go back through his public record and tally his positions on any number of issues, you'll probably find that he'd garner an ACU rating of no more than 20-25 if he had been a member of Congress.