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Omission of “the” in “elected him president” and “made captain”

I was reading a piece on Time and found the following paragraph where they don't use 'a' or 'the' with President. Why no article and what difference does it make if we add one?

Celebration in Dakar, the capital, weren't so much for the triumph of Sall, who still has to prove himself as President.

marked as duplicate by RegDwigнt Apr 4 '12 at 7:32

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