Not:She was elected as a leader of the campaign group. You can say either, but 'a' shows that there are two or more leaders. In any case, it is better just to omit 'as: She was elected leader of the campaign group.
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AnonymousWhy I should say:She was elected as leader of the campaign group.Not:She was elected as a leader of the campaign group.You can say either, but 'a' shows that there are two or more leaders.