Who’s OPA?
The Legislative Aid determines what gets on their representatives desk and often presents the key points n talking points and the position to take. They are slammed with information overload so making it easy to have a framework to present to legislative aids and representatives is very important.
From other experiences, books n letters sent to general mail of representatives never get past mailroom or secretary and are totally ignored in big tsunami pile of mail. A book mailed may never get past mailroom filtering systems and may never make it to representatives office at all.