MAKINI BRICE and NANDITA BOSE THOUSANDS of people took part in a march in Washington on Friday to denounce racism, on the anniversary of the march in 1963 where civil rights leader Martin Luther King Jr made his historic 'I Have a Dream' speech. "You might have killed the dreamer, but you can't kill the dream," civil rights leader Reverend Al Sharpton told Friday's crowd. Activists and politicians gave speeches, including Democratic vice presidential nominee Kamala Harris, who appeared in a recorded video. Many referenced John Lewis, the late lawmaker, who spoke at the 1963 march. They also referred to…