The sports books opened Stanford vs. Washington State with the Cardinal favored by 12 1⁄2 points and has since moved to Stanford by 7 1⁄2. The change in the line reflects that early betters have laid more of their money down on Washington to cover the spread.
Vegas lines and odds aren't meant to be predictive. They are made to entice betting in equal portions on each side of the spread. However, combining the line and the over/under usually ends up close to some computer models.