I think other coaches are looking for punishement and there's pressure to punish Harbaugh.
But I haven't seen any announcement yet. The line seems ok to me though. I make a range of forecasts, you might know.
Stacking percentages Forecast has Michigan winning with 38 points to Penn St's 34 or 31 points. That's a 4 or 7 point victory, with equal enough probability, for Michigan.
The non predictive public gauge has Michigan winning 28-27.
That 3.5 you might have seen was a little jump off of 5 and even 7. There were some very early 3s that were bought up.
But the market's looking to settle here around 4.5 and 5 early on.
So you're right so far, -3.5 is pretty low.