We require food manufacturers to label their products with nutritional information labels so that consumers can make informed decisions about what they purchase.
Since politicians are services that the american public pays for, we have the right to be informed about all contributors to every elected official via handy color coded labeling system. Top 10 donors should be listed. Special emphasis should be added to super pacs, corporations and donors with foreign links.
Each member of congress shall always have this label displayed on all stationary, email correspondence, news articles and video appearances. Monitors shall be installed in all places of assembly to display during all sessions. (I am in the media/tech industry and can facilitate this.)