The years have not been kind to you. I grew up in a profoundly Republican home, so I can remember when you wore a very different face than the one we see now. You've lost me and you've lost most of America. Because I believe having responsible choices is important to democracy, I'd like to give you some advice and an invitation.
First, the invitation: Come back to us.
Now the advice. You're going to have to come up with a platform that isn't built on a foundation of cowardice: fear of people with colors, religions, cultures and sex lives that differ from your own; fear of reform in banking, health care, energy; fantasy fears of America being transformed into an Islamic nation, into social/commun/fasc-ism, into a disarmed populace put in internment camps; and more. But you have work to do even before you take on that task.
Follow the link for the rest, written by Russell King.
Then you can read some responses to the health care bill that illustrate some of the points in the letter.