tr.v. mis··led, (-ld) mis·lead·ing, mis·leads
1. To lead in the wrong direction.
2. To lead into error of thought or action, especially by intentionally deceiving. See Synonyms at deceive.
By selecting the word Mislead, Kerry is fostering the negative connotation of definition number two, while maintaining the fallback position of the first definintion because they can't really show intent.