problem with loading from file

Howdy:

I've been trying to restore a large table from file
using the psql -U <user> -d <database> -f <file>
method and I keep getting the errors about
the index. I've tried to load it a few times and
I get the same thing (error). I do look through
and drop the index before loading again.

What am I doing wrong? Is there a quicker way
to load this? I'm seriously considering sed-ing
out the constraint part of the file and re-loading it;
but that will not solve my long term issue when I
may need to reload a similar table.

Suggestions?

-X

[snip error]

You are now connected as new user web.
psql:/var/tmp/backup_sysdates.Sat:20: NOTICE: CREATE TABLE / PRIMARY
KEY will create implicit index 't_aug4_dates_pkey' for table
't_aug4_dates'
CREATE
REVOKE
GRANT
GRANT
GRANT
psql:/var/tmp/backup_sysdates.Sat:40: ERROR: copy: line 5874678, Cannot
insert a duplicate key into unique index t_aug4_dates_pkey
psql:/var/tmp/backup_sysdates.Sat:40: lost synchronization with server,
resetting connection
COMMENT
COMMENT
COMMENT
COMMENT
COMMENT
COMMENT
COMMENT
[/snip error]