Former Vice President Joseph R. Biden visited Thursday with the Blake family amid rising scrutiny and criticism over Jacob Blake Sr.’s apparent history of anti-Semitic and racially charged social-media posts. Posts accused Jews of controlling the media and financial institutions; mocked White people as “crackers” and “pink toes;” described certain women as “hoes,” and expressed support for the Nation of Islam’s Louis Farrakhan. “The same pink toe Jewish people that control the interest rate control the interest rate they control Minds and money,” Mr. Blake Sr. posted on Nov. 6, 2017. Other posts from 2017-19 included the messages, “I’m with...