Martin Luther King Jr.'s granddaughter, 9-year-old Yolanda Renee King, made a surprise appearance at Saturday's March For Our Lives rally in Washington DC to give a powerful speech that called back to her grandfather's iconic "I Have a Dream" speech.\r\n"My grandfather had a dream that his four little children will not be judged by the color of their skin, but by the content of their character," she said to the crowd. "I have a dream that enough is enough. And that this should be a gun-free world, period."\r\nYolanda was joined on stage by Parkland survivor and gun control activist Jaclyn Corin. After her powerful speech, the nine year old led the crowd in a chant: "Spread the word! Have you heard? All across the nation, we are going to be a great generation!"\r\nAnd now we're all crying forever.