Not really? I'm from an upper-middle class family and I do support a relatively progressive tax structure, so I am in favor of having the upper-middle class shoulder a higher proportion of the the tax burden than the classes below them, but the upper-middle class as commonly envisioned already has the short end of the stick on income taxes. You'd need to redefine the income brackets if you wanted to pursue the progressive agenda of taxing the rich, because simply raising the taxes on the current highest income bracket hits the top 5% harder than the top 1%. We should also be engaging in a more widespread reform of taxes beyond just the income tax as well.
So no because 1. By increasing taxes on the upper-middle class under the current system, you're actually proportionally decreasing the amount the wealthiest echelon of society is contributing 2. Income tax is only part of the picture for reducing wealth inequality. 3. The upper-middle class already gets shafted by the current tax structure.
I do support a keeping a progressive tax structure though.
Out of curiosity, what $ would you consider upper middle class in MA?