Treading carefully in a Trump stronghold, Lamb has campaigned beside national Democrats with moderate reputations, like former Vice President Joe Biden, a Pennsylvania native who grew up in Delaware. He doesn't mention Trump's name.
But Lamb still benefits from the backlash against the president's turbulent debut in office, especially among women in suburban areas. Even some working-class men who voted for Trump have decided that was a mistake.
Given the size of the president's 2016 majority, Saccone can afford to lose some of Trump's base. At a campaign rally with Trump over the weekend, he tried to rouse enough of them to win.
The president also offered Saccone a last-minute boost of administration policy. The tariffs on steel and aluminum Trump has announced are tailor-made for blue-collar neighborhoods outside Pittsburgh, though the once-fabled "Steel City" has diversified its economy around sectors such as technology and health care in the 21st century.
But there's no sign the Republican president's move has reversed Lamb's momentum. For one thing, Lamb has himself offered qualified support for the tariffs — just as he has for some other controversial Trump initiatives such as a military parade in Washington on Veterans Day.