Yes it will, but if the Stream is not the Stream that called the Cast, then none of the leads will qualify.
What would be the purpose of adding a Stream constraint to the campaign? The campaign will only be run against leads who are in the stream the child program is in anyway. Why would you need to specify the stream?
I guess that I wanted to just make sure that the leads would be part of the correct stream. I don't want any errors with leads being in the wrong stream.
But according to your response, it seems that's not something I should worry about. I can remove the constraint then. I was just wondering if it would even effect anything if I included it.