I've had the opportunity to hear Chris Graves from Ogilvy speak a few times, and he's always great - as he is here with Steve Simpson in this head-to-head look at two of ads running in the US presidential election right now. 

Worth a read just for the reference to "amygdala tickling."  Is that something you can even say in the Harvard Business Review? 

What do you think about the ads? Effective?