Martin Luther King Jr. Memorial dedication

Thousands gather at the National Mall in Washington for the dedication of the Martin Luther King Jr. Memorial.

The audience awaits the arrival of President Obama to speak at the dedication of the Martin Luther King Jr. Memorial in Washington on Sunday, Oct. 16, 2011. (AP Photo/Charles Dharapak)

The audience awaits the arrival of President Obama to speak at the dedication of the Martin Luther King Jr. Memorial in Washington on Sunday, Oct. 16, 2011. (AP Photo/Charles Dharapak)

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