No, you're intentionally ignoring the fact that Santo didn't vote like a conservative, no matter what district he came from. That's why HIS rating wasn't higher when he left office. Franky, with his record, I don't know why he rated as high as he did.
"Shocking", huh?
LOL...first you cherry pick the ACU ratings for a single year snapshot to support your point, then when you're called on it, and it's pointed out that their aggregate lifetime ACU ratings are quite close (88.1 vs. 90) you question the validity of the ACU assessment (for Santorum).
You sound like a cheap defense attorney hedging his bets. "Your honor, my client did NOT kill that man, but if he did, it was self defense!"