Andrew Sullivan sums up Zell's speech quite well.

His speech tonight was in this vein, a classic Dixiecrat speech, jammed with bald lies, straw men, and hateful rhetoric. As an immigrant to this country and as someone who has been to many Southern states and enjoyed astonishing hospitality and warmth and sophistication, I long dismissed some of the Northern stereotypes about the South. But Miller did his best to revive them.

It's telling that a politician like Miller is more comfortable speaking at a Republican rather than a Democratic convention.