Comment by cyrus_

Make sure you write down the name of who you spoke to, and see if they'll give you their email address. Then you have way to follow up, either directly or by calling the office and saying you had spoken to so-and-so and wanted to follow up. Obviously the people you speak to can't promise much of anything, but if you bring up something that sounds important to them, they will do what they can to move it through the bureaucracy. Follow-ups can help keep it on the radar or make it more urgent. Obviously there are no fool-proof methods here (and congress is full of fools). And people don't like to say no, so you may need to read between the lines sometimes to figure out that they decided your requests were inconsistent with whatever political school of thought that representative subscribes to.