I downloaded congressional district and county shapefiles from nhgis, i then ran an intersect geoprocess on the two which ended up deleting some of the congressional districts.
This geoprocess overwrote my original shapefiles so I deleted the files and re-downloaded the shapefiles from nghis, but when I opened them up arc the cd file was still missing the districts.
Not sure what is going on here, perhaps a problem with a lock file? I tried renaming the files and looking for a .lock file that I missed somewhere, but no luck. I also tried closing arc and restarting that to see if that would remove the lock but that didnt work either. I am not too familiar with .lock files and have never run into this problem before so I am pretty stumped on where to start looking for answers.
EDIT: im now thinking it is a problem with the original data I am using, could someone confirm this? You can download the data from nhgis, search by geographic levels click all then click Congressional District (1987-1993, 100th-102nd Congress) (by State) and then download it (you do need to have an account). Then see if you are seeing the same thing I am in arc and check the .dbf file to see if is missing arizona (statefp 04) congressional district 01, search 0401.