"o captain! my captain! " walt whitman explain how whitman develops an extended metaphor in his poem.

whitman begins by comparing lincoln to the captain of a ship and his army to a boat. the metaphor honors lincoln and the army for defend and win the idea of freedom. whitman ends the poem by saying that lincoln, the captain, has died. the army and the united states have lost an important leader.

Whitman begins by comparing Lincoln to the captain of a ship and his army to a boat.

Explanation:

From the very start, Whitman calls Lincoln 'captain', and when he says, "our fearful trip is done," we understand that he means "mission accomplished". The line "The ship has weather’d every rack," is an obvious reference to his army. That's how he starts building up his extended metaphor.  

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