President Bush Announces New Vision for Space Exploration Program,
"Beginning no later than 2008, we will send a series of robotic missions to the lunar surface to research and prepare for future human exploration."
http://www.whitehouse.gov/news/releases/2004/01/20040114-3.html
"NASA has reserved time for a later launch in case it can't meet its Oct. 28, 2008 target date to send the Lunar Reconnaissance Orbiter (LRO) to the moon."
http://www.aviationweek.com/aw/generic/story_channel.jsp?channel=space&id=news/integrate121107.xml&headline=Lunar%20Orbiter%20Launch%20Date%20At%20Risk