The Vikings? Well, I haven't seen a lot of bad QB play from us in my lifetime; just middling, with a few magical seasons thrown in here and there ('98, '04, '09, etc.) Gary Cuozzo was not very productive when he played for us in the early 70s. Steve Dils didn't exactly light up the field in '83; 11 touchdowns, 16 interceptions and a 66.2 rating. Brad Johnson had fallen off very noticeably in 2006 with 9/15 and a 72.0 rating. Even Christian Ponder did better than all those guys.
I can't in good conscience pick Tarvaris Jackson because he was capable enough to lead us to the playoffs in 2008, and then his development was interrupted when we signed Brett Favre. I know Spergon Wynn played for us in the early 2000s, but I don't remember him at all and after VD's post I can see why. So yeah, maybe him.