Got this information from a blog item on Telerik (http://www.telerik.com/)
While the Rad Editor by Telerik is a good tool to save the rich html as XHTML,
but the built in save process in SharePoint will strip of the XHTML.
Solution: Instead of saving the Rich text data to a Rich Text field, save it to text field with multilines. In the Page layout use:
<Rad: field="plaintextfield" />
Where plaintextfield is field defined in the content type as Text field with multilines.