That’s what some politicos in Columbia are saying, reports the Christian Science Monitor:

One reason for Sanford’s survival in the topsy-turvy days after his admission of an affair was that his wife, Jenny Sanford, offered to reconcile, appeasing some in Sanford’s evangelical base.
But images of Ms. Sanford herself moving boxes out of the Governor’s Mansion over the weekend raised doubts about whether those efforts – which included recent trips to Florida and Europe – have worked. The couple says the split has more to do with their decision to send their four boys to school near the couple’s coastal home.
Whatever the cause, Republican state Sen. David Thomas is watching. The chair of a legislative subcommittee looking into possible misuse of state funds by Sanford, Senator Thomas says: “The humiliation and embarrassment that this has brought to the state, one has to weigh at what point it reaches the constitutional level of [the governor] being removed.”
Increasingly, Sanford’s personal troubles have hinted at management, travel, and lifestyle choices increasingly at odds with his public image as a frugal conservative with strong family values.
An Associated Press review of Sanford’s travel records found that he used state aircraft for personal trips and took business- and first-class flights on taxpayers’ dime. Sanford told reporters Tuesday that previous governors have used state planes similarly, and he was unapologetic when asked about the pricey commercial flights, according to the AP.

Still, there are major risks to legislative leaders in both parties if they initiate an impeachment probe. Unless there are additional revelations, I’d be willing to bet that they let a wounded Sanford complete his term.