College football rankings, grades: Alabama, Oklahoma earn 'A+', Iowa gets 'D-' in Week 7 report card | CBS Sports Headlines College football rankings, grades: Alabama, Oklahoma earn 'A+', Iowa gets 'D-' in Week 7 report card A look at how the national championship contenders fared in Week 7 ESN FeedsThis … Continue reading College football rankings, grades: Alabama, Oklahoma earn 'A+', Iowa gets 'D-' in Week 7 report card