Those three district wouldn't be all that expensive since they are in smaller markets, but its largly ineffective to advertise since I believe alot the 5th district(Peterson) for instance is in the Youngstown, Ohio media market.
Also I think Todd Platts has only raised like 40k.
The general population is dead-set against this legislation no matter how conservative a district. Nobody would lose a seat for voting against CAFTA now voting for it that's another thing. For example Gene Taylor represents a district that voted atleast about 65% for Bush last time and yet he wins by huge margins.
I'll tell you why its not on his website, because its not on most canidate's websites. In 2003 I checked out every canidate's website from Kerry to Dean to Gephardt to Edwards to Lieberman and it was either not on their websites or very hard to find where they stood on Abortion.
I think signing a pay-raise bill for the legislature, judicial, and the Governor has hurt Rendell. Also I think since the gambling initiative to lower property taxes hasn't kicked in yet that is kind of hurting him. Also Rendell increased income taxes across the board early in his term (Pennsylvania has a flat income tax system).
On the positive side he has done some good things on environmental issues (Growing Greener) and public tranportation.