Advertised as "the academic community's policy source", Policy Central offers several databases covering various aspects of U.S. government, public policy, and business. Among them are National Journal (archived back to 1977), The Hotline (daily briefings on politics), Congress Daily, Poll Track and the Almanac of American Politics. (Updates vary)
This permalink is a direct, persistent URL to the database that will always work and won't break.
The National Journal is updated weekly; the Almanac of American Politics yearly, and everything else is updated daily.