When the Democratic National Committee elected Tom Perez as its new chair on Saturday, it was yet another in a long string of losses for teachers unions. Although the two largest teachers unions in the country did not make an institutional endorsement, the presidents of both unions made a personal endorsement of Rep. Keith Ellison, D-Minn.

Mike Antonucci of the Education Intelligence Agency chronicled the history of teachers union losses, dating back to October 2007 when the American Federation of Teachers endorsed Hillary Clinton for the Democratic presidential nomination. Clinton lost.