ANN ARBOR >> With Michigan State in the Final Four and the Detroit Tigers preparing for opening day, it doesn't seem as if it's football season in Michigan.Except when the fans have a chance to see new coach Jim Harbaugh.An estimated 45,000 fans spent Saturday afternoon watching Harbaugh's debut, as he spent two hours marching up and down the field as Team Blue earned themselves steak dinners with a 7-0 victory in the annual spring game.