The strong union-strong schools suggestion.
PolitiFact takes on the strong union state/strong student performance claim, repeated by Randi Weingarten in her ABC’s This Week appearance. They declare it half-true: Yes, strongly unionized states tend to rank above non-unionized ones in test scores, but the data suggests mere correlation rather than causation.
That weak link goes both ways: It hasn’t been proven that
unionization, per se, brings achievement down either.
While you’re at it, check out all the Truth-o-Meters on education.