One of the most vexing and contentious business disputes in the history of the Delaware Chancery Court has now sparked a kerfuffle for former Vice President Joe Biden as he runs for president.

Shirley Shawe, a shareholder of TransPerfect and the mother of CEO Philip R. Shawe, has spent $500,000 on an ad criticizing Biden, a frontrunner for the Democratic nomination and longtime U.S. Senator from Delaware, for his alleged support of the Delaware Court of Chancery, which oversaw a protracted legal battle between the Shawes and a former part owner that resulted in the rare forced sale of the company. The 60-second ad, which is highly critical of the Chancery Court, is set to run in the battleground states of Iowa and New Hampshire.