FiveThirtyEight.com has a post up about the relationship between politics, religion and income: Religion, Income, and Voting. In it they focus on the relationship between frequency of religious attendance and likelihood of voting for John McCain in the 2008 presidential election. They find a strong positive correlation that looks something like this:

They don’t stop here, however, and go on to break down the relationship in a number of ways.  They first break it down by denomination (click for graph) about which they conclude:

As in 2004, churchgoing is more strongly associated with Republican voting among Catholics and born-again Protestants than among non-born-again Protestants, and all three of these groups represent approximately equal proportions of the population.

They then go on to include the impact income has on the relationship and they find:

They then add the income variable to the “denomination” variable above to provide a sense of the overall relationship between all these variables:

It takes a bit to make sense of all these graphs, but they do tell a story about the relationships between these variables. For example, while a positive correlation between income and voting republican remains for some groups (including Protestants and Catholics) the same does not appear to be as true for others (including Jewish and No Religion).

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