Well, Obama's cap-n-tax bill didn't pass. Does that mean we can't bitch and moan about Obama supporting cap-n-tax?
Your question is silly. If cap-n-trade (or whatever it's called) eventually passes, it will be a first. It will set precedent on that particular set of issues. The 1986 immigration act signed by President Reagan was such a precedent-setting law. My point, in case you really are that obtuse, is to contrast the hatred of GWB among some elements of the right (as represented on FR) due to his support of legislation that never passed, to their simultaneous willfully ignoring the fact that President Reagan actually supported and signed a genuine amnesty bill.
If you hate the one for merely supporting a bill that never passed, then you must hate the other more for actually signing an amnesty bill into law. Either that, or be revealed as a hypocrite.