In citing some study of donation patterns in the primary contest, Ross Douthat labels the GOP the "Party of Sam's Club" citing donations from janitors, waitresses, etc. Sam's Club? Perhaps Sam's Club is different here in Maryland, but the Sam's Club clientele trends upward - upper middle class suburban folks who have the cash and home storage space to buy goods in bulk.
I don't think the lower end demographic Douthat is trying to associate with the GOP (and that's flawed as well since most of those folks vote Democratic even if they're not donating) is the Sam's Club demo. Wal-Mart, more likely.