I haven't seen any polls on this subject. I don't believe they didn't take any; this was too well-orchestrated a hit. They would have measured the outcome.
They aren't bragging about whatever they found.
If I had to guess, I'd say that the real public reaction to the "Santorum crisis" is a big yawn. "Never heard of him" got 73%, "Heard about it but don't remember what it was about" got 11%, and the rest were split between "Politics as usual" and "What do you expect from those evil Republicans?"
If it was anything else it would be all over the news.