Click on the links below to download the codebook and Database
2025 Data release (see Key Sheet for Variable Key including important updates to construction of veto point data)
2022 Data Release (see 2006 release for Codebook)
2017 Data Release (see 2006 release for Codebook)
2012 Data Release (see 2006 release for Codebook)
2010 Release
2006 Release
2005 Release
2002 Release
2000 Release