Gwen Ifill and Judy Woodruff join syndicated columnist Mark Shields and New York Times columnist David Brooks to discuss the issues swirling around Super Tuesday, including how Donald Trump became dominant and the outlook for Bernie Sanders.

The spectacle of Democrats descending on states like South Carolina every four years to “court” the black vote has become a routine part of the primary process. But the highly public courtship involves a more complicated set of calculations on…