At first glance, giving Joe Biden the Iraq portfolio made good political sense. Long known as a transmitter, not a receiver, Biden’s energies would seem to be well consumed at such a distance. And foreign affairs have long been his personal strong suit.

But the mood in the country has changed since the early summer. President Obama finds himself in need of an attack dog at home, especially one who can speak the language of the suburbs and exurbs. He is making a mistake in taking on so much of the job himself.

It is time to let Biden be Biden.