This makes Jamie at Intoxination happy. He moved Crooks and Liars to Drupal from WordPress a while back.
Given the extensibility of Drupal and existing modules that can provide anything from a full social network site to a major campaign site, including email letters, I say we can expect to see a much more user oriented whitehouse.gov.
In email to me, he notes
The Department of Commerce has been switching to Drupal also. And then there’s this new URL shortening site the government made that’s powered by Drupal:
Apparently the government LOVES Drupal.