Sentence:  And I select this sentence as its pertinent summation : `` In essence the drama of his ( Eisenhower 's ) Presidency can be described as the ordeal of a nation turned conservative and struggling - thus far with but limited and precarious success - to give <WSD>effective</WSD> voice and force to that conservatism '' . 
Meaning of the word marked with <WSD> tags:  producing or capable of producing an intended result or having a striking effect