Sentence:  He has argued, however, that the demonstrations do not represent the <WSD>silent majority</WSD> of Japanese (presumably including those in the heartland) who are too anxious about the economy to give up on nuclear energy. 
Meaning of the word marked with <WSD> tags:  The largest portion of a demographic group or of the population of a political jurisdiction, which is considered to possess political and social views that are not openly declared, but that can nevertheless significantly affect voting patterns and social behavior.