I am not sure about the effect of "Pay your fair share" would have, as I am no expert on economics. What I don't like is the way he says it- fair share would indicate same percentage- whatever it is. Aside for a few, rich people do pay a heck of a lot.
If he said "We are in hard times and have to ask to rich for more", then we made an informed decision on that, it would be easier to stomach. I know I didn't word that well, but hopefully the message got through.