The Rev. Martin Luther King Jr.?s eldest son is leading a movement of more than 100 organizations to unite behind voting rights, with a march scheduled in Washington and cities across the country on Aug. 28, the 58th anniversary of his father?s historic ?I Have a Dream? speech. Martin Luther King III along with other civil rights leaders behind the march, including the Rev. Al Sharpton and Alejandro Chavez, the grandson of Cesar Chavez, are demanding that Congress pass legislation to protect and expand voting rights at a time when Republican-controlled state legislatures across the country have passed or introduced hundreds of new voting restrictions which a Washington Post analysis found will likely disproportionately affect Black voters.