PDF file on statement by Bishops of Archdiocese of Denver -- http://www.archden.org/images/ArchbishopCorner/ByTopic/onseparationofsense%26state_openlettercjc8.25.08.pdf
Render Unto Caesar: Serving the Nation by Living Our Catholic Beliefs in Political Life
Book was released August 12, 2008.
Link to the book on the Archdiocesan site:
Render Unto Caesar -- http://www.archden.org/RenderUntoCaesar/