Why does the Obama administration keep looking for love in all the wrong places? Why does it go out of its way to alienate its friends, while wooing people who will never waver in their hatred?

These questions were inspired by the ongoing suspense over whether President Obama will do the obviously right thing and nominate Elizabeth Warren to lead the new consumer financial protection agency. But the Warren affair is only the latest chapter in an ongoing saga.

Mr. Obama rode into office on a vast wave of progressive enthusiasm. This enthusiasm was bound to be followed by disappointment, and not just because the president was always more centrist and conventional than his fervent supporters imagined. Given the facts of politics, and above all the difficulty of getting anything done in the face of lock step Republican opposition, he wasn’t going to be the transformational figure some envisioned.

And Mr. Obama has delivered in important ways. Above all, he managed (with a lot of help from Nancy Pelosi) to enact a health reform that, imperfect as it is, will greatly improve Americans’ lives  unless a Republican Congress manages to sabotage its implementation.