VCF0904 Is House Incumbent Opposed

QUESTION:
---------
Incumbent opposed/ unopposed - checkpoint

VALID_CODES:
------------
1.  Running incumbent is unopposed
2.  Running incumbent is opposed

MISSING_CODES:
--------------
9.  Washington D.C.; no Post IW; wrong district 
    identified (2000)
0.  No incumbent running in CD
Inap. question not used

NOTES:
------
GENERAL NOTE:
1970, 1974 and 1976 data have been derived from VCF0902 (Q.V.).
Code 2 includes opposition from a non-major party candidate if his/her
name was on the candidate list.
Note that for districts where 2 incumbents were running due to
redistricting, neither of whom had previously represented R's location,
this variable has been coded 0.
1978 NOTE:
Several changes to data for type of House race from 1978 have been
made since previous release of the Cumulative Data File (see notes
VCF0902). As a result, VCF0904 and VCF0905 have been changed
accordingly.  
1984 NOTE:
Corrections to original type of race data (SEE VCF0902) are not 
reflected in VCF0903-905.
2004 NOTE:
The extent of the Texas redistricting prior to the 2004 election 
produced House races with incumbents running in areas where he or 
she had provided little or no prior representation, thus no Texas 
candidate has been identified as a true incumbent (running or 
retiring) for the new Texas districts (House type race 44-49).

WEIGHT:
-------
VCF0009/VCF0009a

TYPE:
-----
Numeric  Dec 0

SOURCE_VARS:
------------
1978:  780196 
1980:  800740  
1982:  820006 
1984:  840059 
1986:  860230 
1988:  880725
1990:  900248 
1992:  923021  
1994:  940017 
1996:  960097 
1998:  980065 
2000:  000194
2002:  024500a
2004:  044502