"Indeed, evidence suggests that quality of teaching is the most important non-demographic contributor to student learning."
The sanctity of education reform is a by-product of the sanctity of diversity. Since we all know that diversity is the highest social value, therefore, increasing diversity by allowing in tens of millions of illegal immigrants and their descendants is an unquestionable good.
Unfortunately, the test scores don't support that.
So, "all we have to do is fix the schools." That must be easy, because if it's not easy, that would call into question the goodness of diversity, and that is unquestionable.