Here is an article about how writing a letter can have a big impact.
http://www.washingtonpost.com/wp-dyn...T2010033004292

You could easily not give your whole name or your address, if you weren't worried about getting a (personal) response. I research in some presidential archives of letters, and there are lots in there that got read by someone but didn't have an address or a name. Writing the president is really not going to get you in trouble, but if you are worried, you could do this.