Final answer:
The poem 'O Captain! My Captain!' is an elegy written in honor of President Abraham Lincoln.
Step-by-step explanation:
The poetic form of 'O Captain! My Captain!' is an elegy. An elegy is a poem that is typically written in honor of someone who has died. In this case, the poem is an elegy for President Abraham Lincoln, who was assassinated.
Learn more about poetic form of 'O Captain! My Captain!'