I see this issue as one of understanding what one (in this case the prez) is saying, by understanding where the word comes from. In the case of nuclear, it means relating to the nucleus or nuclei. (not molecules) Obviously this is rather key to the whole concept of nuclear weapons, arsenal, etc.. As I have never heard these other words pronounced as nu-que-lus or nu-que-li, I tend to view the use of nu-que-lar as an indication of ignorance.
Now, you may just look at it as a cute little verbal quirk of Dubya's, but I wouldn't want my children to imitate it.

Hello to all!