EVERYONE! Using the NRA link it's incredibly easy to email the committee members. Just click on the name and it will open up a pre-addressed email using your email client. Paste in your personal message, send, repeat 6 times. Once you have your message composed actually emailing them only takes a minute or two - for something this important - it couldn't be easier!
There is no excuse not to email them all - and follow it up with a fax and phone call.
Make them realize that there are active voters paying attention!