text:  And Sean O'Brien was at the RNC to give a speech. Big speech, actually. The keynote speech on the first night of the convention. And I should say, the Teamsters Union president hasn't spoken at the RNC ever before in the entire history of the union. Because, maybe this is obvious, Republicans have been the party of big business. And generally pretty opposed to organized labor. Zoe Chase tells how this played out. Here's how weird it is that this guy Sean O'Brien is at the RNC in the first place.