Jake is right-the Philly suburbs, especially Montco are very libertarian. Republicans still outnumber Democrats, and yet we voted for Kerry and Schwartz. Although we still have a good number of Santoomeyites and hard-core liberals, the RINOs/Liberal Republicans are the key voting bloc in Montco.
I think the RINOism in Motnco is largely due to legacy, establishment, and dealing with the local government, not how people actually feel. Granted, Montco is a moderate county economically and a liberal (if not VERY liberal in some parts) county.