The last time was in 1984. They simply did not see the point since they controlled the ComDem (Democrat) Party since the 1970's.
source on date:
https://en.wikipedia.org/wiki/Communist_Party_USA#Presidential_tickets
While the D party often proposed socialist programs , it used to scrupulously avoid and always deny any connection with “ real commies. “. This ain’t your grandpa’s D party anymore. And the clearer the R candidates point this out, the more D voters will wake up and switch
Does the oath of citizenship say anything about Communist affiliation? Are citizens these days bound that oath?
ConnectiCommie? Didn’t they stage a school shooting in that state too? My they are busy!