It sounds like a story with a happy ending. Eighteen months ago Hillary Clinton and Barack Obama were at each other’s throats as they battled for the White House. Then, after Mr Obama’s inspired selection of his old rival for the top US foreign policy post, the two turned into a team, with Mrs Clinton becoming the most formidable asset of the administration.
There is only one catch to the tale. There is no guarantee that it will finish on an upbeat note.

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