I believe that if all people of my income paid more, we could make a difference.
I support all people of my income, including me, paying more taxes and opposed me alone paying more taxes.
The evidence you've provided does not provide significant support to your conclusion.
Here's what WOULD support your conclusion: If given the choice between someone who would increase taxes for people of my income or keeping them the same/lower (ceteris paribus), I voted for the latter. If I'm voting for the former, that straight up contradicts your position.
Guess how I vote. Guess how the author votes.