non-owner superuser needs to be able to vacuum

Hi:

A superuser cannot vacuum tables. The error message is "WARNING: skipping "thetable" --- only table or database owner can vacuum it"

The superuser was defined like this...

create role cover_super SUPERUSER LOGIN;
grant all on database cover to cover_super;
grant all privileges on map_src_info to cover_super;
grant all privileges on insts to cover_super;
grant all privileges on temp_pins to cover_super;

The error message seems to indicate that defining a superuser which is not the table owner to vacuum is futile ("only table or database owner can...").

Is there a way to vacuum with a non table owner ?

Thanks for any help!