Joe isn't the Democratic candidate for president yet. You are assuming that he will be. People can still vote against him. Here's some more shocking news (article form Rolling Stone):
Biden Rejects Calls to Apologize for Praise of Segregationist
Why would he do that? Why is it apparently so hard for him to apologise? Does he not think Segregationists are wrong?
Biden Rejects Calls to Apologize for Praise of Segregationist
Why would he do that? Why is it apparently so hard for him to apologise? Does he not think Segregationists are wrong?