Thank you for this light-at-the-end-of-the-tunnel column. Jimmy Carter would be the perfect antidote to combat the unbelievable skulduggery rampant in our government today. By actively participating in building homes for the poor and disadvantaged, he is setting an example unheard of in the scheme of today's politics. His modesty, his open, honest friendliness, and his sincere desire for peace are unique qualities that should be recognized and honored.Are we ready for such a change? Are there sufficient numbers among us, the constituency, who are thoroughly fed up with the current goings-on? I'd like to think so! Edith C. Smith, Erwinna, Pa. Letters are welcome. Only a selection can be published, subject to condensation, and none acknowledged. Please address them to "Readers Write," One Norway St., Boston, MA 02115.