The Wall Street Journal reports that Wal-Mart Stores (NYSE: WMT) is warning its store managers against an Obama victory in November. Why? because Wal-Mart executives worry that Obama will boost the power of unions and that unionized Wal-Mart stores will lead to higher worker pay -- and higher prices for Wal-Mart customers.

I can understand why Wal-Mart executives would want to keep President Bush's policies in place for another four years. After all, those low taxes on the top 1% help enrich Wal-Mart brass. I am not suggesting that all Wal-Mart customers are Republicans, not at all, but I do believe that most people who shop at Wal-Mart cannot afford to buy their shoes at Neiman Marcus. And these middle- and lower-income Wal-Mart shoppers are the natural beneficiaries of Democratic policies such as Obama's plan for a middle-class tax cut.

Wal-Mart is clearly trying to be on both sides of this election. The Journal reports that it's reduced its share of contributions to Republican candidates from 98% in 1996 to 52% in 2008 -- giving 48% of its $2.2 million in political contributions to Democrats this year. It also has directors who have been big Clinton supporters, including Hillary Clinton herself who served on its board from 1986 to 1992 and Aida Alvarez, who worked in Bill Clinton's cabinet from 1997 to 2001 and has been a Wal-Mart director since 2006.