[https://edition.cnn.com/2020/08/28/politics/march-on-washington-black-national-convention-trnd/index.html](https://edition.cnn.com/2020/08/28/politics/march-on-washington-black-national-convention-trnd/index.html) Friday's March on Washington has kicked off with emphatic calls for police reform, justice reform and voter action, 57 years to the day after Dr. Martin Luther King Jr.'s "I Have a Dream" speech echoed from the same spot on the National Mall.