From the Wall Street Journal:
School reformers generally agree that the most important education resource is the teacher. But one of the biggest obstacles to putting a good instructor in every classroom is a tenure system that forces principals to hire and retain teachers based on seniority instead ...
Gene Healy of the Cato Institute says it quite well:
The president isn't a benevolent father-protector, charged with the welfare of all creatures great and small — and educators do kids a great disservice if they help promote such a childish notion. Still less was he supposed to be the educator ...