Even letters under 300 words are edited for length, especially when volume is as heavy as it is during a political campaign. Second, short is good. Yes, I'm repeating myself. But don't you. Use brevity to your advantage.
People are busy.
If you can tell them in two short paragraphs why George W. Bush has won your support or why Bill Bradley is all wet on health care, do it. People are more likely to read a short letter than a long one. Third, check your facts. We all make mistakes, and we'll do our best to catch yours. But particularly when a letter is critical of a candidate, an obvious falsehood or distortion is reason enough to spike the letter.