The head of the Teamsters union spoke at the Republican National Convention, but he hasn’t been invited to address the Democrats in Chicago. Plans are in the works for Vice President Kamala Harris to hold a roundtable discussion with members of the Teamsters. But the union’s president, Sean O’Brien, has yet to get an invitation to speak at this week’s Democratic National Convention. He angered some Democrats by speaking at the GOP convention last month, where  O’Brien criticized both major political parties. The Teamsters say the decision on a presidential endorsement will be made after the conventions.