congress no.
id number (icpsr and Poole/Rosenthal)
icspr state code
congression district (0=Senate or President)
name of state
political party (100=Dem, 200=Repub, 328=Ind)
name of member
common space score 1st dim.
common space score 2nd dim.
chamber code = 0 if House, 1 if Senate, 2 if President