Senator Byron Dorgan of North Dakota is endorsing Barack Obama, on a call with reporters he's specifically citing trade-related issues as important to his thinking. Dorgan was a NAFTA opponent, and is a leading congressional skeptic of centrist consensus trade policies. He's also talking about Obama's greater ability to help build the party in "red" areas in the plains and the mountain states.

We want to hear what you think about this article. Submit a letter to the editor or write to letters@theatlantic.com.