If I may opine for a second, over on the Texas CHL Forum, they have ample experience calling their local rep to deal with the current backlog on CHL applications. The general consensus has been to use snail mail, or call, instead of e-mail if you really want a response. E-mail is easy;Mike's written the letter, all you have to do is copy and paste it into your e-mail program and send it from however many mail accounts you have. As such, it is not given as much weight as a stamped letter. An inbox can be cleaned out in a few minutes and it doesn't have the same weight (on many levels) as one of those white bushel-size mailbaskets full of letters arriving every day.
I certainly encourage those here to copy and paste the letters, not into Outlook or Thunderbird, but into Word or OpenOffice. Print them out, with a copy of the bill, put them in an envelope, stamp them and drop them in the box. It'll cost you just over $1.00, you'll give the postman something to do besides deliver junk mail, and you'll be taking a far larger stride to get your senator's attention.