Sentence:  There breathes no being but has some pretence / To that fine instinct called poetic sense; ... / The <WSD>freeman</WSD>, casting with unpurchased hand / The vote that shakes the turrets of the land. 
Meaning of the word marked with <WSD> tags:  A person who is a citizen of a free country, as opposed to a subject of a tyranny or totalitarian dictatorship.