Sentence:  His proposal <WSD>is</WSD> opposed to that of Richard Nixon , Governor Rockefeller , past chairmen Strauss and McCone of the Atomic Energy Commission , Dr. Edward Teller and those others now enjoying their hour of triumph in the exacerbation of the cold war . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)