The text is taken from the online petition at www.rallycongress.com
My personal info has already been redacted, so all you'll need to do is the following:
1) download and unzip the file, and open the letter of your choice;
2) insert correct date at the top, and add your own signatory info at the close;
3) print envelopes using the individual justice's name/address from each letter;
4) add postage and mail.
203kb in total, unzipped.