Should Sean O'Brien, president of the Teamsters Union, be a speaker at the DNC? He said a lot of things at the RNC that flies in the face of the Republican party, but it looked like a lot of the general crowd agreed with him about workers rights and the strength of unions even if they don't understand that their Republican leaders will only work against their best interests. If the Democrats cut him out, couldn't they be hurting their message of union support and a strong middle class?