There are actually two preachers speaking at the Inauguration, though you might not know it. One is Rick Warren, which everyone knows. The other is Joseph Lowery, a Methodist preacher who was a leader in the civil rights movement, who will be giving the benediction at the inauguration. He’s known as a progressive voice that, as Ben Smith of Politico notes, serves in combination with Rick Warren to provide a look at the kind of political coalition that Barack would like to put together, with people from both sides.
Here’s a video of Lowery in action, delivering the eulogy at Coretta Scott King’s funeral in rhyming verse. You’ve got to see it to appreciate it.