Slightly off-topic, but...
About a month ago, I sent the Clinton campaign an email asking why she alone among Democratic candidates (at that point) had refused to sign the anti-torture declaration that was being floated around.
Needless to say, I got no answer, other than a generic email thanking me for my comments and welcoming me to the campaign. Now I get all of the Clinton campaign's missives asking me to wish Hillary a happy birthday, make a contribution to her warchest, and so forth.
I only mention this in the event that the Clinton campaign ever touts the size of its online community. Said community may not be all it seems!
I think it's good that you ask questions of the campaigns, but I can't believe you really expect to get a personal response to your email. I sent one to Clinton and Obama last week about FISA, and got the same kind of responses you did (from both campaigns), a short thank you note. I imagine they get thousands of emails, and it's ridiculous to expect that the campaign can respond personally to every email. When I call my senator's office to make comments, I don't really expect to talk to the Saxby Chambliss (just writing that makes me want to hurl) personally.