Many US presidents – the past two included – begin their terms vowing to focus on domestic problems, but end up obsessed with foreign policy. For Barack Obama, who on Friday travels to Trinidad for the Summit of the Americas, having stopped off to visit Felipe Calderón, his Mexican counterpart, that switch may come unusually quickly.
Mr Obama is feted abroad, even if he is finding it harder than his predecessors to impose Washington’s agenda on the world. But the realities of dealing with an increasingly multi-polar world pale in comparison to the growing migraine he faces at home.

Obama’s first 100 days 

