WaPo breaks the news that there is a tentative agreement in D.C. on the teachers contracts. Two things to keep in mind. First, it is tentative and now has to be approved, but the fact that Randi Weingarten signed it should help a great deal with that. Second, the teacher pay provisions are likely to get the lion’s share of attention because they’re interesting and novel. But the changes on tenure and seniority are very significant as well and bear watching.