DataMart and Demzilla were databases that were rolled out by the United States Democratic Party from 2002.
Demzilla was a smaller database used for fundraising and organization volunteers, it includes the names and information persons or groups the DNC does business with, and those who are donors to the Democratic party, it also includes volunteers, activists, local and state party leaders, and members of the press.
[1] The goal was to aggregate and analyze voter and public information data in order to target Democratic voters as part of their national GOTV effort as well as fund raising campaigns.
The Republican Party had a similar project, the Voter Vault, started in the 1990s.
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