President Ma Ying-jeou (left) is greeted by supporters at an election rally Thursday in New Taipei City, Taiwan. Mr. Ma is being challenged in Taiwan's presidential election by Tsai Ing-wen (right). Ms. Tsai's party rejects unification with China.

President Ma Ying-jeou (left) is greeted by supporters at an election rally Thursday in New Taipei City, Taiwan. Mr. Ma is being challenged in Taiwan's presidential election by Tsai Ing-wen (right). Ms. Tsai's party rejects unification with China.