To late:
http://internic.net/cgi-bin/whois?whois_nic=whitehouse.gov

Whois Server Version 1.3

Domain names in the .com, .net, and .org domains can now be registered
with many different competing registrars. Go to http://www.internic.net
for detailed information.

   Server Name: WHITEHOUSE.GOV.HAS.THE.BEST.TERRORISTS.NET
   IP Address: 170.1.75.141
   Registrar: NETWORK SOLUTIONS, INC.
   Whois Server: whois.networksolutions.com
   Referral URL: www.networksolutions.com


>>> Last update of whois database: Tue, 24 Oct 2000 08:08:25 EDT <

The Registry database contains ONLY .COM, .NET, .ORG, .EDU domains and
Registrars.

I could be mistaken, but I think that this is simply a matter of setting up a third level domain which contains the phrase "whitehouse.gov".

I propose a test: CowboyNeal, if you're listening, set up "microsoft.com.owes.money.to.slashdot.org"