Advocates for gay, immigrant rights march in footsteps of blacks

Martin Luther King Jr. waves to supporters on Aug. 28, 1963, in what he called "the greatest demonstration of freedom in the history of the United States."
Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. AFP PHOTO (Photo credit should read -/AFP/Getty Images) (Agence France-Presse/Getty Images)

Martin Luther King Jr. waves to supporters on Aug. 28, 1963, in what he called "the greatest demonstration of freedom in the history of the United States." Martin Luther King was assassinated on 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. AFP PHOTO (Photo credit should read -/AFP/Getty Images) (Agence France-Presse/Getty Images)

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