"Martin Luther King Jr. president of the Mongomery Improvement Association, which organized the Montgomery bus boycott of 1955. This began a chain reaction of similar boycotts throughout the South. In 1956, the Supreme Court voted to end segregated busing," (ushistory.org).
Senators represent the whole of their state, a much larger number of people than members of the House of Representatives. A 6 year term gives them more time work for the people they represent.
