Answer:
Who is the speaker of the poem O Captain My Captain?
That suggests to me that the speaker in that poem is Whitman himself. Reynolds appears to share this view (emphasis mine): In Whitman's best-known poems about Lincoln, "O Captain! My Captain!" and "When Lilacs Last in the Dooryard Bloom'd," the silencing of his former poetic self is noticeable.
Step-by-step explanation: