I gotta find some time to actually write a little, but for now, read this and this! Samples of how Bush is being told to pronounce hard foreign names like 'Caracas'.
Just don't think Bush is the only one to do it ... Kennedy's famous "Ich bin ein Berliner" also involved crib notes. (See below.)
Or if you're truly boring and want to read something about the evolution of language by a linguist, see here.