 Complete the following phrase:  On March 3, Sanders spoke in Selma, Alabama, at a commemoration event held to remember the civil rights march known as Bloody Sunday. Later that day, Sanders held his second rally in Chicago, Illinois. As at his first event, he spoke about income and social equality, but in Chicago, Sanders spoke more extensively against racial disparities. Sanders discussed his personal involvement in the civil rights movement, including his leading role in the 1962 University of Chicago sit-ins and his participation in the 1963 