Barack Obama, who is struggling to recapture the early promise of his presidential campaign, is sending his wife, Michelle, to London next week to try to generate cash and excitement for a bare knuckles fight against Hillary Clinton.
Ms Obama's visit will be fleeting, but the timing is crucial. Even her husband admitted on Thursday that Ms Clinton, with her lead in polls, fundraising and endorsements, had become the "default candidate" for Democrats, and that he needed to take her on more directly.
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