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U.S. President Barack Obama (R) waves with his wife Michelle Obama during a commemoration of the 50th anniversary of the historic civil rights march on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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U.S. President Barack Obama speaks in front of the Edmund Pettus Bridge on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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Former first lady Laura Bush, first lady Michelle Obama, U.S. president Barack Obama, U.S. Rep John Lewis (D-GA) and former U.S. president George W. Bush pray during a commemoration of the 50th anniversary of the historic civil rights march on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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Former first lady Laura Bush, former U.S. president George W. Bush, first lady Michelle Obama, U.S. President Barack Obama and U.S. Rep John Lewis (D-GA) look on during a commemoration of the 50th anniversary of the historic civil rights march on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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U.S. President Barack Obama leads a delegation across the Edmund Pettus Bridge during a commemoration of the 50th anniversary of the historic civil rights march on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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U.S. President Barack Obama leads a delegation across the Edmund Pettus Bridge during a commemoration of the 50th anniversary of the historic civil rights march on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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U.S. President Barack Obama speaks in front of the Edmund Pettus Bridge on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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U.S. President Barack Obama leads a delegation across the Edmund Pettus Bridge during a commemoration of the 50th anniversary of the historic civil rights march on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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Police snipers inspect the Edmund Pettus Bridge ahead of a speech by U.S. president Barack Obama on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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U.S. President Barack Obama speaks in front of the Edmund Pettus Bridge on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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U.S. President Barack Obama speaks in front of the Edmund Pettus Bridge on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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U.S. President Barack Obama (R) hugs U.S. Rep John Lewis (D-GA) speaks in front of the Edmund Pettus Bridge on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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People wait to hear U.S. president Barack Obama speak in front of the Edmund Pettus Bridge on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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People wait to hear U.S. president Barack Obama speak in front of the Edmund Pettus Bridge on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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People wait to hear U.S. president Barack Obama speak in front of the Edmund Pettus Bridge on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)
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People wait to hear U.S. president Barack Obama speak in front of the Edmund Pettus Bridge on March 7, 2015 in Selma, Alabama. Selma is commemorating the 50th anniversary of the famed civil rights march from Selma to Montgomery that resulted in a violent confrontation with Selma police and State Troopers on the Edmund Pettus Bridge on March 7, 1965. (Photo by Justin Sullivan/Getty Images)