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There were 16 state Republican nominating contests to go, extending into early June. Trump would have to win more than 60 percent of the remaining delegates in order to claim the nomination at the national convention next July. Republicans have not had a contested convention since 1976. In the Democratic race, former secretary of state Hillary Clinton is facing growing competition from her sole challenger, Vermont Senator Bernie Sanders. Sanders has defeated her in six of the last seven state nominating contests, including Tuesday's primary in Wisconsin.
contest n. 竞赛；争夺；争论vt. 争辩；质疑
competition n. 竞争；比赛，竞赛
nominating提名…为候选人（ nominate的现在分词 ）任命 ,提名,推荐,指定