For great insights and anecdotes on the topic of why the poor tend to vote Republican nowadays
READ 'DEER HUNTING with JESUS' by Joe Bageant.
"After thirty years spent scratching together a middle-class life out of a “dirt-poor” childhood, Joe Bageant moved back to his hometown of Winchester, Virginia, where he realized that his family and neighbors were the very people who carried George W. Bush to victory. That was ironic, because Winchester, like countless American small towns, is fast becoming the bedrock of a permanent underclass."
The Poor aren't so much voting for Republicans as much as they are VOTING FOR GOD. Since the 70s, their preachers have told them to vote Republican----so they do-------without thinking.
Republicans have also catered to and courted THE UNINFORMED VOTER.
The Poor have been easy targets for Karl Rove and Company.