Recently (June 7th), I posted about"Ask Your LawMaker" and this morning ran across this better description by Andy Orami that includes some analysis of the potential for this site/service.
If you want to influence lawmakers, this is an incredibly powerful tool. Simply put, if people don't use it, it won't work. If you don't have a burning question, check it out anyway and see what others are asking. You may find that what you think is something only you care about is really something that others also care about. Then you add your vote and others add their votes and you discover that your "unimportant" question is really something that a lot of people care about.
Ask Your LawMaker can only work if we use it and if we also check the questions periodically to vote on those questions that are important to us. So, check it out, see what questions people are asking, and vote for those questions that you want asked.