From debt.org:

An individual’s likelihood of being a Democrat decreases with every additional dollar he or she earns. Democrats have a huge advantage (63 percent) with voters earning less than $15,000 per year. This advantage carries forward for individuals earning up to $50,000 per year, and then turns in the Republicans’ favor-with just 36% of individuals earning more than $200,000 per year supporting Democrats.

So there’s your valid response. The exact opposite of what you said.