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Denver high school students preparing to march on Martin Luther King Day.

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Members of the King Baptist Church marching on Martin Luther King day in Denver.

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Members of the King Baptist Church marching on Martin Luther King day in Denver.

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This mother and young children were among the thousands who marched on Martin Luther King Day in Denver.

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This woman was one of the thousands who marched on Martin Luther King Day in Denver.

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These two young women were among the thousands who marched on Martin Luther King Day in Denver.

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These two young girls were among the thousands who marched on Martin Luther King Day in Denver.

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This mother and young daughter were among the thousands who marched on Martin Luther King Day in Denver.

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This mother and young children were among the thousands who marched on Martin Luther King Day in Denver.

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This man was one of the thousands who marched on Martin Luther King Day in Denver.

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Many young children were among the thousands who marched on Martin Luther King day in Denver.

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One of many families preparing to march on Martin Luther King Day in Denver.

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This young boys waves from a car during the Martin Luther King Day "marade" in Denver, Colorado.

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Denver Mayor Michael Hancock (fourth from the left), and former Denver Mayor Wellington Webb (to Hancocks left) march together on Martin Luther King Day in Denver, Colorado.

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These two men raise their fists in the air while marching on Martin Luther King Day in Denver.

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This young man carries the Norwegian flag in the Martin Luther King Day "marade" in Denver.

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This member of the ACLU was among the thousands who marched on Martin Luther King Day in Denver.

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Thousands marched through downtown Denver to celebrate Martin Luther King Day.

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This mother and young daughter listen to speakers on Martin Luther King day in Denver.

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This woman and young man listen to speakers on Martin Luther King day in Denver.

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This woman listens to speakers on Martin Luther King day in Denver.

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These two women listen to speakers on Martin Luther King Day in Denver.

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These young women listen to speakers on Martin Luther King Day in Denver.

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Listening to speakers on Martin Luther King Day in Denver.

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Listening to speakers on Martin Luther King Day in Denver.

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Listening to speakers on Martin Luther King Day in Denver.

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Listening to speakers on Martin Luther King Day in Denver.

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Denver activist Elisabeth Epps speaking at the Martin Luther King Day Rally in Civic Center Park.

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Taking a "selfie" at the Martin Luther King Day rally in Denver.

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Members of "Moms Demand Action", a group advocating stricter gun control laws, preparing to march on Martin Luther King Day in Denver.