Telephone calls are far more effective than E-Mails. I've been calling congress for the past 7 years and IMHO the telephone calls do the trick. When the calls come in one after another it really gets to the help and they in turn let the bosses know whats going on!
Patriotic Boston is right! E-mails don't carry half the weight of phone calls.
I will make the calls today,and one of the things I will tell Leahy's office is that I'm boycotting Vermont products. Yesterday I bought cheese from New York and maple syrup from Canada. My usual Christmas mail orders with Vermont companies aren't going to happen this year and I'm going to call and tell them why!