You are indeed having a difficult time. This link should be (I hope) a simple enough definition of 'standing'.
Need I point out that most of those in need of a gun that would meet this definition, but by law can't... are probably dead now. Abstractions, such a questioning the Constitutional Validity of a law before harm can be proven, are automaticly discarded as not rising to this level.
This guy in Colorado can now say he meets the Standing requirements and challenge the law before the Supremes DUE TO HIS ARREST. Without that, he would have no case under these criteria.
Thanks Va. I appreciate the info even if I took a different spin on it after reading it. Do you know of any case law that I could look into to see if anyone has mustered a successful challenge with a Standing as you described it? Just a link to point me in the right direction would be helpful, I really don't want you to feel that I have you doing my leg work for me. I just don't know where to start looking. Gimme a push...;-)