No I haven't seen any Irey-Murtha polls from PA-12. I've really only been watching for about 2-3 months so if one was released early this summer I would have missed it. The major state polling firms (Mason-Dixon, Survey USA, Rasmussen, Gallup, and others) only poll areas when they are paid to do so by media outlets (with the exception of Rasmussen).
The lack of polls therefore may be due to a media blackout about the race. Rasmussen would have polled there but he only does statewide races, not districts (The only House race poll I've seen from him was Barbara Cubin in WY-AL).