Pay-wall business model is broken and thus I don't think this site in this form will ever be successful. The thing to do would be to compile all the publicly available information pulling out relevant information via filter for particular topics, groups, and interests. The way to pay for it all is to charge representatives, senators, presidential candidates, etc. money to have an 'official from them' page on the page that describes what they do and who their interests are. The public should never have to fork over any money, or information to these congresspeople, unless they specifically create an account to ask directed questions to congresspeople who are paying money to be on the site. Should charge $25k per year to each state representative ( at a federal level ) and $50k per year for each senator. CA and other state legislators should have to pay $5-10k per year depending on their level. Presidential hopefuls should pay something like $1m per cycle. Most to all of these people are millionaires, and their campaign funds should be allowed to be used on this site. It should also give information about effectiveness of voting technologies, etc.
disclaimer, I wrote up a site like this, but haven't coded/launched because success is dependent on design skills and the ability to implement them, not in quality/quantity of info. Until ordinary citizens are using it, no rep is going to pay for it as a platform for access, and it needs really great design to get ordinary people to use it. If I become rich this is the first site I'm going to throw money at because I think we really need something like this.