The Oklahoma Education Association held a press conference Friday to deliver the grade to the first-term Republican. OEA President Linda Hampton said the 35,000-member association has "no confidence" in the grades.
Pushed by Republicans like Barresi who swept into office in 2010, the grading system was supposed to make it easier for parents to see how their child's school was performing.
But the rollout over the last two years has been marred by delays and fierce resistance from some superintendents to the formula that's used to determine the grades. A recent change by lawmakers dramatically increased the number of failing schools.