I'm a bit confused by your post, but it's probably because I'm tired.
There is a formula, and it goes like this:
If you e-mail, it counts it as 10 voters.
If you call, it counts it as 50 voters.
If you write a letter, it counts it as 100 voters, but send letters to local office because of Anthrax scare in D.C.
If you go in person, it counts it as 500 voters.