Did they "export and download" as per DWS?

In a statement on the company's blog, NGP VAN CEO Stu Trevelyan apologized to the Clinton and Sanders campaigns and explained how the data was able to be viewed:

"On Wednesday morning, there was a release of VAN code. Unfortunately, it contained a bug. For a brief window, the voter data that is always searchable across campaigns in VoteBuilder included client scores it should not have, on a specific part of the VAN system. So for voters that a user already had access to, that user was able to search by and view (but not export or save or act on) some attributes that came from another campaign." some attributes that came from another campaign."