The candidate recognized that his attempt to build a broad base of support had been thwarted, but he was still discomfited by the magnitude of his defeat.
In English language, a word is a unit of language which comprises one or more spoken sounds and alphabets that connotes a thing, action, event, etc.
In this scenario, we can logically deduce that the most appropriate words to complete the sentence are thwarted and discomfited. Thus, the candidate recognized that his attempt to build a broad base of support had been thwarted, but he was still discomfited by the magnitude of his defeat.
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