In terms of the effective practice of politics, even apart from the wisdom or morality of one or another policy, yesterday offered a couple of extraordinary lessons in how not to be president. It's easy to criticize, and it's hard to be president, but surely it's worth learning from what doesn't work.
The first lesson came from former president Barack Obama. His intervention in the DACA debate yesterday afternoon was a stark reminder of the peculiar combination of recklessness and moral preening that so often characterized his approach to the presidency. He took no responsibility for the situation he did so much to create; he just lectured the people who are stuck with it.