Mikie Sherrill, once comfortably ahead in the New Jersey governor’s race, has been getting plenty of attention over her stock trading lately, and not in a good way. Her fellow lawmakers should take note if they also have aspirations for higher office.

The Democratic New Jersey congresswoman seemed like a shoo-in to succeed Phil Murphy as her state’s governor, an office that trended blue in recent years. Yet she is now neck-and-neck with Republican Jack Ciattarelli , a successful businessman before entering politics. Her problem: disclosures that she spent some considerable time day-trading stocks while she was in office, possibly — if her critics are right — profiting off nonpublic information to make profitable trades.

Rising public disgust over her alleged insider trading could c

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