Sarah Palin is another one of these politicians who say "nucular."

And look, there's a Wikipedia entry on "Nucular":

Usage by politicians

U.S. presidents Dwight D. Eisenhower, Jimmy Carter, Bill Clinton, and George W. Bush, as well as Presidential Candidate Walter Mondale and Vice Presidential Candidate Sarah Palin, have all used this pronunciation.

Ha ha. It's just the special, presidential way to say "nuclear."