Apparently they changed the software used to store the data, in the bottom on https://open.obamawhitehouse.archives.gov/ https://open.obamawhitehouse.archives.g

Apparently they changed the software used to store the data, in the bottom on https://open.obamawhitehouse.archives.gov/ https://open.obamawhitehouse.archives.gov/ it says "powered by dkan", on https://open.whitehouse.gov/ https://open.whitehouse.gov/ it says "powered by socrata". Maybe it was not easily possible to migrate the data and/or it is planned to be done later.