Janai Nelson, president and director-counsel of the NAACP Legal Defense Fund, argued her first case in front of the Supreme Court this week, defending Section 2 of the Voting Rights Act, which protects voters from racial gerrymandering. She joined The Weekend: Primetime to explain what's at stake and what she and others are "fighting to preserve." For more context and news coverage of the most important stories of our day click here: https://www.msnbc.com/ » Subscribe to MSNBC: https://www.