Radical leftist norman lear is now involved with their production.
He directed one episode, two seasons ago. Parker and Stone have had many guest directors over the years. Lear was one of many. The creators of SP are self identified libertarians, so they definitely skew both sides of the political spectrum, but they save the most vitriolic and scathing attacks for leftists. They have bashed Babs Streisand relentlessly, called Clinton a d*ck, and drilled Whoopi Goldberg as well. If you'll watch, you'll see that they save the worst for the libs.