In 2004, for example, Zogby reports that while John Kerry lost the popular vote to President. George W. Bush by just 3%, "he lost among weekly Wal-Mart shoppers by a whopping 76%-24%. Meanwhile, those who told us they never shop at Wal-mart went just the opposite direction, voting 80% for Kerry and 18% for Bush."

Here's how Zogby, based on his polling, breaks down the liberal-conservative ratio at some other stores: Bloomingdale's 48% liberal-26% conservative; Macy's 42-32; Marshalls 34-35; Neiman Marcus 39-30; Target 39-46; Sears 16-57; J.C. Penney 21-50; Kohl's 23-50. The balance of shoppers in each case opted for the middle ground.

Note that the higher-end retailers draw a larger share of liberal customers. If you agree that liberals are largely inclined to vote Democratic, what's that say about the supposed party of unions and working folks? And since conservatives lean heavily Republican, what about the stereotypical image of the GOP as the party of the wealthy?

Zogby says these breakdowns are so solid that "I've come to think of retail locations as a cluster of mini-precincts." If you're shopping during this hyper political weekend, you might want to think about the message you're sending. My usual stop, Meijer's, was not on Zogby's list.