Is it a conservative show? Beyond a shadow of any doubt. Is it a Republican show? Definitely not. Used to believe the Democratic party would split first but it's becoming quite clear Republicans and Conservatives are coming to a major difference of opinions on more than a few issues lately
You're very much right that the terms "conservative" and "Republican" shouldn't be used interchangeably; perhaps I did, but I didn't mean to.
The show is def. not "Republican", but to me it doesn't seem terribly conservative either. The show generally portrays all authority as inept at best and criminal at worse - not that one should be skeptical of all authority until they prove their worth, but that all authorities are worthless and thus should never be respected.
I can heartily endorse skepticism, but it seems SP, like most modern US entertainment, veers pretty much into full cynicism, and that strikes me as very harmful in a democracy (because instead of ever seeing gub'mint as possibly being us, the people, it will always be seen as hopelessly, eternally oppressive).
I enjoy watching SP, but I don't like the idea of viewing it as the basis of a desirable ideological viewpoint. I don't mean to sound reactionary about that.