OK, Stolle is not around, but I'll (Jeff Kiger) step up and put this oddity out there.
One reviewer in San Francisco actually tied (loosely) the insane Joker performance to Minnesota politics. I, for one, did not see that one coming.
Here's the pertinent passage from SF Chronicle movie critic Mick LaSalle's review:
With his smeared lipstick and painted white face, he is every clown who ever terrified a child. He speaks in a measured, Middle American accent, enunciating his words carefully, a voice that could tell bedtime stories in hell. (He seems, actually, to be imitating Al Franken.)
Hhmm… It is hard to know how to respond to that.
I need to tip the hat to Steve Perry and the Minnesota Independent for discovering this.