Vikings greet Tarvaris Jackson with a pick six

It’s a good thing that the Seahawks already have installed newcomer Tarvaris Jackson as the team’s starting quarterback.  Otherwise, Jackson may not have won the job. In his second preseason start, Jackson completed 11 of 21 passes for 75 yards and a first-quarter interception, which was returned by Marcus Sherels for a 64-yard touchdown.  The…