PHOTOS: Crowds gather for 'Bloody Sunday' anniversary in Selma

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Saturday, March 7, 2015
Demonstrators march over the Brooklyn Bridge to mark the 50th anniversary of the landmark event of the civil rights movement in Selma, Ala., on March 7, 2015, in New York.
Mercedes Binns, who has been to Selma 17 times because of its civil rights history, walks on the Edmund Pettus Bridge, Sunday, March 8, 2015, in Selma, Ala.
The Rev. Martin Luther King III walks with supporters before President Barack Obama gives a speech in Selma, Ala. to mark the 50th anniversary of "Bloody Sunday" on March 7, 2015.
Singing "We Shall Overcome," President Barack Obama, fourth from left, walks holding hands with Amelia Boynton, who was beaten during "Bloody Sunday."
President Barack Obama exits Air Force One with daughter Malia Obama, left, and Sasha Obama, on arrival at Maxwell Air Force Base in Montgomery, Ala.
President Barack Obama speaks near the Edmund Pettus Bridge, Saturday, March 7, 2015, in Selma, Ala.
The United States Secret Service drives across the Edmund Pettus bridge with President Barack Obama on March 7, 2015, in Selma, Ala.
President Barack Obama speaks by the Edmund Pettus Bridge in Selma, Ala., Saturday, March 7, 2015, for the 50th anniversary of "Bloody Sunday."
A large crowd forms near a stage where President Barack Obama will speak and then take a symbolic walk across the Edmund Pettus Bridge on March 7, 2015, in Selma, Ala.
The Rev. Al Sharpton waves to supporters before President Barack Obama and others take a symbolic walk across the Edmund Pettus Bridge on March 7, 2015, in Selma, Ala.
A large crowd forms near a stage where President Barack Obama spoke and took a symbolic walk across the Edmund Pettus Bridge on March 7, 2015, in Selma, Ala.
A large crowd forms near a stage where President Barack Obama will speak and then take a symbolic walk across the Edmund Pettus Bridge on March 7, 2015, in Selma, Ala.
The Rev. Jesse Jackson speaks with people before President Barack Obama and others take a symbolic walk across the Edmund Pettus Bridge on March 7, 2015, in Selma, Ala.
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PHOTOS: Crowds gather for 'Bloody Sunday' anniversary in SelmaDemonstrators march over the Brooklyn Bridge to mark the 50th anniversary of the landmark event of the civil rights movement in Selma, Ala., on March 7, 2015, in New York.
AP Photo/John Minchillo

SELMA, Ala. -- Crowds gather on March 7, 2015, before a speech by President Barack Obama marking the 50th anniversary "Bloody Sunday," a civil rights march in which protesters were beaten, trampled and tear-gassed by police at the Edmund Pettus Bridge, in Selma, Ala.