Well I had this thought:
We get a scipt running where the webmaster/creator of a campaign could register with us and would get a password to submit stuff. Improper use of it would result in that users access being terminated and the information he posted removed. That takes care of your spamming problem whilst removing the majority of the work for us once the systems running.
Links, news, general information, maybe some images and a download link could all be filled out to create a neat little overview of each campaign along with up to date news and so on.