Variables:
year: Year in which CPDF was published (2007 or 2010)
OPMabbrev: Standardized 2-letter agency abbreviation in the Office of Personnel Management's Central Personnel Data File
OPMcode1: Standardized 4-character agency or subagency abbreviation in the Office of Personnel Management's Central Personnel Data File
agency: Agency Name
ST: State in which the employee's work station is located
county: County in which the employee's work station is located
fullname: Employee's name in the CPDF, listed as LAST, FIRST MIDDLE
title: Employee's title, as listed in the CPDF
Common Space: Employee's estimated Common Space DW-NOMINATE (first dimension), for employees that have made sufficient campaign contributions during 1979-2012