I am sure that someone will come by with some great SQL skills to make this easier, but in the meantime here's what I do:
Download the PGAdmin tool and connect it to your postgreSQL DB. Go to the Graphical Query Builder and chose Schemas > Public> jm From there, check box the tables you want (body_string is the actual text)and then run the query.
Again, this is the quick and dirty version I've been using for testing, but it does the trick.
Gareth