How can I reset the list of sent campaigns?

I have a sent queue full of administrative test campaigns that I’d like to have reset and removed. Can this be done through the admin panel or the config file or do I need to edit one of the core pages?

@ensweb phlist lets you delete a campaign only when there has not been any opens or clicks of links.
You can use the Campaigns plugin which allows you to delete sent campaigns. On the Manage Plugins page follow the Find plugins link to see the available plugins.