Let me say it a different way then. I'm not sure if its productive or counterproductive to advocate for a 70% rate. Consider the following for a moment:
One of the most brilliant framing of an issue over the last 40 years was the right convincing middle class and even some poor Americans that they all are paying the top tax rate. That way they can advocate for tax cuts for their benefactors while claiming to help out the little guy, who ends up getting no benefits from top level tax cuts. Go around saying that you want to double taxes on the top tier and half the country thinks they're getting a tax increase. Yes, that's stupid but its reality.
The good news is, at long last the left has a counter narrative, which is the concept of the "1%". Its succinct, people get it, and its not hard to know that you're not in Romney or Bush's income bracket. So, the game becomes not raising top level tax rates, which most super wealthy don't pay anyway, but to address things such as carried interest or deferred capital gains and other things. Most Americans know they aren't taking advantage of that, thus making it a lot easier to effect tax hikes on the wealthy if that's the goal.
