Poverty, conservatism, and evangelicals

Spokane is one of the most conservative cities in Washington. It has the highest rate of evangelical Christians. It also has the highest poverty rate in the state. Is there a correlation between conservatism or evangelicalism and poverty? As someone who is fairly conservative, I find this thought disturbing.

My job is to do community outreach for a college. I spend my days working with special interest groups, churches, non-profits, and charities. The people that seem the least interested in helping the poor are the evangelicals. Well, maybe not the least interested--they want to help, but they are least likely to do something.