Sarah's slides are available here.
The speaker was Sarah Allen (ultrasaurus), a returning Presidential Innovation Fellow (PIF) who was at the Smithsonian Institution. Sarah covered a lot about her experiences as a PIF generally, but also had one big point about the technology/government divide:
In her view, a large majority of government web projects are fundamentally CMS systems with a few customizations specific to the project. When she got to DC, she didn't want to use PHP, but -- precisely because Ruby doesn't have any well-supported, "clear winner" CMSs -- she couldn't justify rebuilding a lot of the functionality that Wordpress or Drupal give you out-of-the-box.
While there are a bunch of Ruby CMSs ( https://www.ruby-toolbox.com/categories/content_management_systems ) there's nothing at the point of being a clear winner with a strong commun