In Obama’s statement 3rd paragraph, last sentence - he says that McCain opposes this bi-partisan bill.
As I noted, another source reported the letter I cited.
In addition, it would be odd if McCain did in fact oppose it, because the bill originally saw the light of day as the McCain-Lieberman bill.
You may very well be right and me mistaken. But, in any event, we do know that McCain is making "global warming" a centerpiece of his campaign.