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.