The Rev. Martin Luther King Jr. addresses a Selma, Ala., rally on Feb. 22, 1965, telling the crowd that blacks won't abide by Gov. George Wallace's ban against night demonstrations. Wallace issued the order after a racial incident in Marion, Ala., during which several people were injured. (AP Photo)

A brace of plow mules drawing the farm wagon bearing the mahogany casket of Dr. Martin Luther King, Jr., along the funeral procession route in Atlanta, Ga., April 9, 1968. Reverend Jesse Jackson, in green, and Andrew Young, at the left corner of the casket, are among some of the mourners. (AP Photo)

Thousands of demonstrators stream to the courthouse behind Dr. Martin Luther King Jr. at Montgomery, Alabama, March 17, 1965. The march was to protest treatment of demonstrators by police during an attempted march. At front and center of march in white shirt is Andrew Young. (AP Photo)

Dr. Martin Luther King speaks March 25, 1967 at the Chicago peace march. (AP Photo/Chick Harrity)

Apr 09, 1968; Atlanta, GA, USA; MARTIN LUTHER KING JR.'s funeral in Atlanta. (Credit Image: ? KEYSTONE Pictures USA)/ eyevine

The Rev. Martin Luther King Jr. acknowledges the crowd at the Lincoln Memorial for his

The signature of Rev. Martin Luther King, Jr. on a copy of Time Magazine naming him as Man of the Year is featured in an exhibit of black journalism as part of Black History Month at the National Press Club in Washington Friday, Feb. 3, 2006. (AP Photo/Gerald Herbert)

Riders pass a mural as they take part in a march honoring Martin Luther King Jr., Monday, Jan. 21, 2013, in San Antonio. The nation honors civil rights leader Martin Luther King Jr. on Monday, the same day as it celebrates the inauguration of the first black president to his second term. (AP Photo/Eric Gay), APTOPIX

US President Barack Obama paints a quote of Martin Luther King Jr. on the wall of a library at the Browne Education Center in Washington, DC, on January 16, 2012, to take part in a community service project in celebration of the Martin Luther King, Jr. Day of Service and in honor of Dr. King's life and legacy. AFP Photo/Jewel Samad

President Barack Obama tours the Martin Luther King Memorial in Washington, D.C., Oct. 14, 2011. (Official White House Photo by Pete Souza) Barack Obama

Undated image of Martin Luther King, Jr, at an African-American church in Chicago, Il. Photo by Donald M. Schwartz.

June 1965 photograph of Martin Luther King, Jr., standing with Robert Dosseh, then the Archbishop of Lome, Togo.

Civil rights leader Martin Luther King, Jr. (1929-1968).

Dr. Martin Luther King, Jr. is seen, date and location unknown. (AP Photo)

** CORRECTS TRANSMISSION REFERENCE NUMBER ** From left to right, Rev. Bernice King, Dexter Scott King, Martin Luther King III and Yolanda King, stop in front of the casket of their mother Coretta Scott King as she lies in honor in the historic Ebenezer Church on Auburn Ave. in Atlanta Monday, Feb. 6, 2006. (AP Photo/Ric Feld, Pool)

The rejected Martin Luther King, Jr. statue stands Oct. 28, 2005, in a Rocky Mount, N.C., city warehouse. Rocky Mount is working to replace the statue with a new one. (AP Photo/Karen Tam)

A Montgomery (Ala.) Sheriff's Department booking photo of The Rev. Martin Luther King Jr. taken Feb 22, 1956, with the words ''Dead and the date of 4-4-68'' scrolled on it, is shown Friday, July 23, 2004, in Montgomery, Ala. Dozens of photographs from the civil rights-era were recently discovered in a storage room used by the Montgomery County Sheriff's office. Chief Deputy Derrick Cunningham said he was performing some house cleaning duties when he found a photo-album containing well-preserved mug shots of protesters who were arrested during the Montgomery bus boycott in 1956. (Montgomery County (Ala.) Sheriff's office) / eyevine

Dr. Martin Luther King is engaged in a conversation with King Olav V of Norway, in this undated photograph. (AP Photo)

Civil rights leader Dr. Martin Luther King, Jr., is pictured in an undated portrait. Location unknown. (AP Photo)

Coretta Scott King, widow of slain civil rights leader Dr. Martin Luther King, Jr., is shown at a press conference in Atlanta, Jan. 11, 1986, to launch a 10-day celebration for the first national holiday for Dr. King. A poster depicting King is in the background. (AP Photo/Ric Feld)