You betcha!! Wait...WHAT?!!

The last week or so, Benson's been responding to everything with a "You betcha!", which I thought was sort of cute and I assumed it was something he picked up from one of the preschool teachers (although I can imagine neither of them actually saying it, now that I think about it)...but I just caught up on my PVR and Saturday Night Live with Tina Fey doing Sarah Palin...so I'm left wondering...how did Benson pick up a Palin-ism?!!