partycodes: political parties appearing in the U.S. Congress
In pscl: Political Science Computational Laboratory

partycodes

R Documentation

political parties appearing in the U.S. Congress

Numeric codes and names of 85 political parties appearing in Poole and Rosenthal's collection of U.S. Congressional roll calls.

data(partycodes)

code: integer, numeric code for legislator appearing in Poole and Rosenthal rollcall data files
party: character, name of party

The function readKH converts the integer codes into strings, via a table lookup in this data frame.