By Robert Schmad States with stronger teachers' unions tend to have weaker literacy performance and have adopted fewer of the policies credited with improving reading outcomes, according to a new analysis from a left-leaning think tank. Eight of the 10 states to score among the worst in the Progressive Policy Institute’s (PPI) assessment of early-literacy policies were home to powerful teachers' unions. Among the top 60 percent of states in terms of early-literacy policy scores, only four had strong teachers' unions. Mississippi, Arkansas, Georgia, Louisiana, South Carolina and Indiana, all Republican-leaning states with weak unions, were among the states with the best literacy outcomes. Maine, New York, Illinois, Hawaii, Washington and Rhode Island, blue states, were among the worst. The pattern isn't universal. Maryland, a blue state with a strong teachers' union, has posted strong reading results, while South Dakota, a red state with a weaker union, has s...