That's the beauty of push polling, full deniability. You know who did it, but can't prove it unless someone talks.
“You know who did it, but can’t prove it unless someone talks.”
The group doing the push polls has openly described its activities to the news media on numerous occasions.
As in this Associated Press report two days ago:
http://ap.google.com/article/ALeqM5gFdJLRoMsNkoGISqo7DvPxX0P7-QD8U6NO700