I believe they were effective in the midterms during Trump's presidency to preserve the Democratic majority in the House. Postcard writing helped motivate people to vote by stirring them from their political hopelessness. The example of John Lewis' battle cry to "get in good trouble" remains pertinent today. It is a cry to do something; rather than to observe history, to be part of it; to be influential in some small way. By how many votes did Bush win Florida?