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Now Playing: Former Secretary of State Colin Powell’s thoughts on today’s inauguration
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Now Playing: Sen. Roy Blunt on the inauguration
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Now Playing: Wreath-laying ceremony at Arlington National Cemetery
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Now Playing: Sen. Bernie Sanders on the inauguration
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Now Playing: Presentation of inaugural gifts
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Now Playing: Rev. Silvester Beaman delivers benediction
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Now Playing: How the weather has affected past inaugurations
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Now Playing: Poet Amanda Gorman reads 'The Hill We Climb'
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Now Playing: President Joe Biden delivers his inaugural address
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Now Playing: Kamala Harris and husband Doug Emhoff arrive at US Capitol on Inauguration Day
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Now Playing: Joseph R. Biden sworn in as 46th president
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Now Playing: Kamala Harris sworn in as vice president
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Now Playing: Joe Biden's entrance to his inauguration
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Now Playing: Sen. Amy Klobuchar delivers opening inauguration remarks
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Now Playing: Joe Biden arrives at US Capitol ahead of inauguration
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Now Playing: A brief discussion about the ‘nuclear football’
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Now Playing: Kamala Harris' sorority sisters on the importance of her history-making moment