Published March 15, 2012, 12:00 AM

Calumet


U.S. Rep. Tammy Baldwin looks at a monitor in one of the control rooms that shows how Calumet refinery in Superior operates as manager Dave Podratz, left, explains the process. (Jed Carlson/jcarlson@superiortelegram.com)


Read the article: Congresswoman, senate candidate tours northern Wisconsin