This suggestion is for your system administrators and programmers (I am a programmer myself):
PLEASE implement an auto-rejection script that uses a regular expression to detect the words "birth certificate", "long form", "illigitimate", and "Obama", and automatically deletes all matching submissions before they get posted.
Design this script so you can add new terms as required, since the people making all this noise will undoubtably try to work around anything you do.
Please don't worry about this being counter to your goal, which is open government. This approach SUPPORTS the goal of open government by significantly reducing the signal to noise ratio of this site.
Bottom line: Kill all the posts by crazy people, and let those of us who have constructive ideas to post be heard. PLEASE.