Grow the LP - Grow the Libertarian Party by writing letters to the editors.
Most people read the shorter letters first and then perhaps later read the longer ones.
Thus your shorter letter has a better chance of being read. Replying to editorials, agree or disagree, is very effective. Every day the news offers us all too many topics on which to comment. State the argument you're rebutting or responding to, as briefly as possible, in the letter's introduction. Stick to a single subject.