Explain it then in these terms:
http://www.freerepublic.com/focus/religion/3271436/posts?page=211#211
I'm not all too familiar with this sort of dedication. There's a response in post #215--which I mention not in order to use it as my answer (or to agree with it) but simply to say that someone else, who's presumably more experienced and more aligned with this type of prayer, has given an answer within a line of thought and devotion that has a readier answer for this sort of thing.
My line of thought is simply that I don't see "one mediator" as the best argument against "praying to the saints"; in my view, it would "prove" too much if used in this fashion, and there are more substantial challenges regarding such prayer.
We'll have to agree to disagree on this one then; however, there is one argument that is difficult to deny: Christ taught the disciples to pray to "Our Father...." Not Abraham, not Moses, not Solomon or David. God the Father. And we pray to Him in the name of Christ --
And yet now, he IS our mediator. One mediator. THE mediator. And the CCC teaches that Mary is mediatrix. That implies that she in some way shares in the ability to provide salvation and grace -- which she cannot and does not -- and, logically, for Catholics to obtain this (false) grace and mediation, what must they do?
Pray to her.
So, in my mind, the "one mediator" argument succinctly puts the whole Mariolatry heresy in the proper perspective of the false gospel it is.
Hoss