Brendan Bordelon argues at National Review Online that former President Bill Clinton could hurt his wife’s White House bid in the crucial opening campaign state.

With the Democratic race in Iowa tightening, Bill Clinton is preparing a whirlwind tour through the state to shore up Hillary Clinton’s slipping support. Over four stops on Thursday, the former president will bank on his considerable popularity with the Democratic base to sway voters against Bernie Sanders’s insurgent populism.

Not all Iowa Democrats are nostalgic for the 1990s, however. In a state with a heavy manufacturing presence and a powerful organized-labor lobby, union workers still hiss the word “NAFTA” as if it were a curse. These workers blame the 1994 trade deal — and the Clinton White House that ratified it — for sharp declines in jobs and wages in the past two decades, and Bill Clinton’s presence in the state won’t convince them to fall in line behind his wife’s campaign. In fact, if Sanders’s Tuesday-morning speech to the Des Moines chapter of the United Steelworkers Union is any indication, Clinton’s last-minute campaign swing could have the opposite effect.

“You don’t have to look very far down the road to Newton, Iowa, where our Maytag plant closed and devastated that town and those folks in that city. That was NAFTA,” said USW Local 310 president Steve Vonk as he introduced Sanders, his voice dripping with contempt. “And we know where that all came from.”

Later, away from the podium, Vonk explains that Clinton’s family history makes him second-guess her change of heart on the Trans-Pacific Partnership (TPP), the latest free-trade deal working its way through Washington. “NAFTA was signed by her husband,” he tells National Review. “She called TPP the ‘gold standard’ of all trade deals not that long ago. Until Bernie called her out on the issue, she was fully for it. Now she says she won’t sign it as it’s written now.”

“She’ll sign it — and we all know that — eventually,” Vonk says. “That’s my biggest issue.”