I don't know if letters would have any relevance or not. Personally I hope they do if people have ther desire to write them. No matter which discussion forum promotes the idea I hope it works. If it doesn't it is just a little time wasted.
I went ahead and wrote a letter even though I am not from Colorado or New Mexico. I would be thrilled if my letter made a siginifican t difference. I would be happy if somebody who counts just read it. I would only be out a few minutes of my time if everybody simply ignored it.
No matter what, it doesn't hurt to try.