The Redistricting Data Office coordinates the tabulation and release of Census Bureau data sets that are of specific interest to those in the redistricting and elections communities.
On this site you will find:
Census 2000 Public Law 94-171 Redistricting Data
Congressional District Data
State Legislative District Data
Voting Rights Determination Data
Source: U.S. Census Bureau | Redistricting Data Office | Last Revised: September 01, 2009