Why do poor people vote for Republicans?

It has never ceased to amaze me that so many fiscally challenged people in the United States vote for conservatives in spite of the fact that said conservatives are constantly working to widen the gap between the wealthy and the poor. I've done plenty of research on this topic and have come to the conclusion that the only possible reason that poor people in this country still vote for conservatives despite how blatantly selfish and greedy they are is because they are uneducated and it's what their parents did before them. Any thoughts?