In a book generously larded with charts I believe this is the most representative and informative one: (cite: Quarterly Journal of Political Science Volume 2 Issue 4, 2007: “Rich State, Poor State, Red State, Blue State: What’s the Matter with Connecticut?”) In short, as you can see, the rich in Connecticut, the wealthiest state per capita, are not much more Republican than the poor.By breaking down the data into county-level units Red State, Blue State, Rich State, Poor State also generates a plausible explanation for why mainstream pundit Conventional Wisdom would hold that the poor vote Republican more than the rich, even though on an aggregate national scale this is simply not so.In blue states the wealthier counties tend to be more blue (though within these counties the rich may still be more Republican; you can see this in Manhattan where the only precincts where Republicans attain parity with Democrats are in the wealthiest neighborhoods of the Upper East Side). and New York, where the upscale regions tend to tilt heavily Democratic, while economically depressed rural counties in the hinterlands are more likely to tilt Republican.In blue states the wealthy are more socially liberal than the poor, but somewhat more economically conservative.
Though wealth gets mention in the title, I think it is important to highlight the fact that there is another independent variable which gets extensive treatment in Red State, Blue State, Rich State, Poor State: religion.
While the Republican elites are unanimous in their support for economic conservatism, the Democratic elites are not in their hostility.
“Pro-business” Democrats in states like Connecticut have to balance the fact that their constituents span the economic spectrum, from blue-collar union members to hedge fund managers with physics doctorates.
To a first approximation the rich tend to vote Republican, the poor tend to vote Democratic, the old stereotype holds.
But there is also the reality that the wealthier states tend to vote Democratic and the poorer ones tend to vote Republican.