This year I saw the greats of the Obama-era Iran nuclear

  deal breeze between meetings in a way impossible at the height of those negotiations.

  Yet a few years later, their sage experience is the valued currency of many backroom conversations.

  John Kerry’s sidekick, Wendy Sherman, strolled down t

he street past former US Energy Secretary Ernest Moniz, also a member of the Iran nuclear dea

l negotiating team. He was loitering on a street corner waiting for a car. If you had a question for them, you could ask it.

  These people are the unseen grease in the cogs of international diplomacy.

  But the showstopper at the conference was the Yin and Yang of US foreign policy — delivered by Vice President Mike Pence and the guy who had the

job before him, Joe Biden.They spoke on the same day, but could not have been more different in tone, style and substance.

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