Interesting -- Userland accepts my XML RSS feed but Validator doesn't

Userland validated my RSS feed and later said:

Your XML file is correctly formatted. An email has been sent to the system manager requesting approval.
...
Here's what the channel looks like from our point of view:

Easter Lemming - Liberal News 3/17/2003 10:11AM PST

Iraq: We No Longer Have Weapons of Mass Destruction
Salon - Tom Tomorrow - Here are the keys to the White House Oh Mighty Conquerer
War Imminent; No UN Vote; Bush To Address Nation
Second resolution withdrawn
Salon -- Scud Stud "Bush is out of control"
NYTimes -- Humanity's Slowing Growth
Anti-war protesters raid London oil exchange
...

RSS Validator returns this:

Sorry
This feed does not validate as RSS.

line 10, column 50: lastBuildDate must be an RFC-822 date [help]

Sunday, March 16, 2003 8:18:07 PM
^

line 14, column 70: XML Parsing error: :14:70: not well-formed (invalid token) [help]

http://www.reuters.com/newsArticle.jhtml?type=topNews&storyID=23926 ...
^

Source: http://elemming2.blogspot.com/rss/elemming2.xml