I believe Carter was known to say "nukular" frequently. I'm sure we could find out for sure if we axed the right people.
My latest peeve (though not exactly an abuse of the language) is the term, "at the end of the day". EVERYONE'S using it, all the time, and it's so tired.....already!
Example: "We're pushing this legislation, because 'at the end of the day' it will create more jobs."