Comment: You're right

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In reply to comment: Hand write the (see in situ)

You're right

just 2-3 short sentences is enough to tell them how you feel and what you want. If you're trying to get other people to sign the letter, making it lengthy or having many issues discourages them from signing.
Handwritten letter are best, but an e-mail doesn't hurt. I tell them I oppose military action and that I'll be informing others of their decision between now and election time.