@abcnewslive: Thousands gathered in Washington, D.C. on the anniversary of Martin Luther King Jr.’s “I Have A Dream” speech for what some civil rights activists called a “Defend the Vote March.” The event followed the Supreme Court decision in April which struck down Louisiana's congressional map as an unconstitutional racial gerrymander and dealt a blow to Section 2 of the Voting Rights Act. ABC News’ Karen Travers reports. #MLK #WashingtonDC #civilrights #voting #news #politics #abcnews