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Now Playing: For Martin Luther King Jr. Day, honoring the civil rights icon at his former ministry
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Now Playing: Experts discuss a post-Trump America and healing a divided nation
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Now Playing: DC on high-alert as threats expand to all 50 states ahead of Biden’s inauguration
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Now Playing: Remembering the life of Joanne Rogers, the widow of TV legend Mr. Rogers
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Now Playing: Inauguration security ramps up, over 300 people face charges in Capitol riot: Part 2
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Now Playing: DC police officers recount violence, lawmakers demand Capitol security probe: Part 1
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Now Playing: Experts compare Jacob Blake’s violent arrest to Kyle Rittenhouse’s release on bail
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Now Playing: Jacob Blake tells his story after being shot 7 times by police
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Now Playing: Experts weigh in on whether more Republicans will support Trump’s impeachment
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Now Playing: Trump faces 2nd impeachment unless Pence invokes 25th Amendment, Dems. say
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Now Playing: Amid siege of US Capitol, Biden addressed the nation: Part 7
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