Tổng thống Mỹ Obama thay đổi chiến thuật vận động tranh cử
Tổng thống Mỹ sẽ tập trung chủ yếu vào việc diễn thuyết, quyên góp tiền và huy động cử tri từ xa, chứ không đi vận động trực tiếp ở các khu vực bầu cử.
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