I don't think the super rich (who drive the bulk of campaign donations) even care about this tax. As we saw in France a few years ago, when the tax rate goes up the very wealthy simply move their assets out of the country and evade the higher taxes. This usually leads to a reduction in total tax revenue collected.
Hard to do for the CEO/banker crowd. US citizens are taxed on worldwide income anyway, unlike the French, so even if you go offshore, you still get taxed on your compensation.
