"In the strongest terms, I implore you to not run this advertisement, " he wrote.

CNN: McCain says U.S. government failed New Orleans

If you are considering having plastic surgery, I implore you: Do your homework.

CNN: Plastic surgery: 'Wild West' of medicine

Some have called it callow, but I implore you to go back and see Leonardo DiCaprio and Kate Winslet in this movie and watch how dazzlingly spontaneous and multi-faceted their chemistry is.

CNN: Review: 'Titanic 3D' is a work of art

And so when you think about the next 26 days, I would implore you to ask yourselves, is there something else I can do?

WHITEHOUSE: Remarks by the President at a Campaign Event in Miami, FL