Civil rights pioneer Rosa Parks has died at the age of 92. It was 50 years ago this December that she refused to relinquish her seat to a white man aboard a city bus in Montgomery, Alabama. She was arrested and convicted of violating the state’s segregation laws. Her act of resistance led to a 13-month boycott of the Montgomery bus system that would spark the civil rights movement. The boycott would also help transform a 26-year-old preacher named Martin Luther King Junior to national prominence. In 1958 King wrote “no one can understand the action of Mrs. Parks unless he realizes that eventually the cup of endurance runs over, and the human personality cries out, 'I can take it no longer.''’ Parks had been involved in the fight for freedom since the 1940s. She was active in the NAACP, helped raise money to defend the Scottsboro rape case and attended trainings at the Highlander Folk School of Tennessee. The Rev. Jesse Jackson said yesterday ’'She sat down in order that we might stand up. Paradoxically, her imprisonment opened the doors for our long journey to freedom.'’ Henry Louis Gates Jr called her “the Harriet Tubman of our time.” After he was freed from jail Nelson Mandela recalled how Parks had inspired him and others in the South African struggle against apartheid. We'll have more on Rosa Parks in a few minutes.