The backlash has posed an early and important stress test on Mr. Biden’s hold on a constituency that has helped elevate him to his front-runner perch in the polls: African-Americans. Senators Kamala Harris and Cory Booker both questioned Mr. Biden’s grasp on the painful history of segregation, and Mr. Booker called on him to apologize. The former vice president struck back. “Apologize for what,” he said outside a fund-raiser on Wednesday night, in turn calling for Mr. Booker to apologize. The episode was the most frontal confrontation yet of the presidential primary for Mr. Biden.

Source: New York Times June 20, 2019 21:10 UTC