The three leading contenders all have ties to Wal-Mart, a decidedly controversial company among Democratic primary voters.

Between 1986 and 1992, she served on the Arkansas-based company's board of directors, a position that let her rake in about $12,500 per year. During the 1992 campaign, she still owned about $80,000 in company stock.

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Last January, the senator scolded Wal-Mart for not doing enough about healthcare--but withered when asked if she ever suggested a change when she served on the board. "Well, you know, I, that was a long time ago, I have to remember." Not a good answer.

Clarke notes that John Edwards "used to own company stock--stock he conveniently managed to sell in 2004."

In an impressive demonstration of historical repetition, the senator's wife, Michelle, earns about $45,000 per year (plus stock options) serving on the board of a major Chicago food company whose biggest customer is--one guess--Wal-Mart. If that connection seems pretty distant (and, really, the connection is pretty distant) just think about all the tenuously relevant personal details that can railroad a perfectly respectable presidential campaign. Campaign critics can make a four-course meal out of pretty thin gruel.