Hey there, I worked on this.
BSD, BlackBaud, and Salsa all deliver messages to congress, but only for advocacy organizations who are willing to pay. Beyond OpenCongress, I don't think there are any tools that make it easier for constituents to write their own non-cookie-cutter messages to Congress. Change.org, for example, doesn't deliver emails.
The reason why Congress receives millions of messages is because advocacy organizations send millions of form letters. Congressional staff already have plenty of tools for separating those form letters from real, constituent-written letters. I can dig up their names, but they're built by high-level contractors.
Finally, one of our plans for Democracy.io is to measure response rates from representatives, and to use that to release a public report on how well MoC respond to real constituent messages. Both in terms of timeliness, and the relevance of their response.
BSD, BlackBaud, and Salsa all deliver messages to congress, but only for advocacy organizations who are willing to pay. Beyond OpenCongress, I don't think there are any tools that make it easier for constituents to write their own non-cookie-cutter messages to Congress. Change.org, for example, doesn't deliver emails.
The reason why Congress receives millions of messages is because advocacy organizations send millions of form letters. Congressional staff already have plenty of tools for separating those form letters from real, constituent-written letters. I can dig up their names, but they're built by high-level contractors.
Finally, one of our plans for Democracy.io is to measure response rates from representatives, and to use that to release a public report on how well MoC respond to real constituent messages. Both in terms of timeliness, and the relevance of their response.