WASHINGTON — Joe Biden stood in a Pennsylvania metal works shop, just miles from his boyhood home, and pledged to define his presidency by a sweeping economic agenda beyond anything Americans have seen since the Great Depression and the industrial mobilization for World War II.

The prospective Democratic presidential nominee promised the effort would not just answer a pandemic-induced recession, but address centuries of racism and systemic inequalities with “a new American economy” that “finally and fully (lives) up to the words and the values enshrined in the founding documents of this nation — that we’re all created equal.”

It was a striking call coming from Biden, a 77-year-old establishment figure known more as a back-slapping dealmaker than visionary reformer. But it made plain his intention to test the reach of liberal populism as he tries to create a coalition that can defeat President Donald Trump in November.

Trump and his Republican allies argue Biden’s positioning, especially his ongoing work with progressives, proves he’s captive to a “radical” left wing. Conversely, activists who backed Bernie Sanders or Elizabeth Warren in the Democratic primary were encouraged, yet cautious, about Biden’s ability to follow through while conceding that his plans on issues including climate action and criminal justice still fall short of their ideals.

Biden’s inner circle insists his approach in 2020 is the same it’s been since he was elected to the Senate in 1972: Meet the moment.

“He’s always evolved,” said Ted Kaufman, Biden’s longest-serving adviser. “The thing that’s been consistent for his entire career, almost 50 years, is he never promises things that he doesn’t think he can do.”

Biden’s evolution has been on display from the start of his campaign as he’s shifted left in substance and style while trying to preserve his pragmatist brand.

At the start of the Democratic primary, Biden was positioned as offering a moderate alternative to Sanders’ call for a “political revolution” and Warren’s push for “big structural change.”

The former vice president countered their proposed universal government-funded health insurance with a government insurance plan that would compete alongside private insurance. Progressives wanted tuition-free public higher education; Biden offered tuition subsidies for two-year schools. Biden called the climate crisis an “existential threat” and offered a clean energy plan with a trillion-dollar price tag, but resisted the full version of progressives’ Green New Deal. He promised hefty tax hikes for corporations and the investor class but opposed a “wealth tax” on individuals’ net worth.

Biden noted his health care platform put him to the left of 2016 nominee Hillary Clinton and President Barack Obama, who had jettisoned a “public option” from his 2010 health care law, angering liberal Democrats.

And on race, even before the recent national uprising against police violence, Biden spoke often of the nation’s systemic failure “to live up to” the Declaration of Independence. “Thomas Jefferson didn’t,” he said often in early speeches, alluding to the fact that the Declaration’s author owned slaves.

Still, Biden isn’t immune from the kind of internal party tensions that cost Clinton progressive support in 2016, and he’s spent the last three months shoring up his left flank.

Biden and Sanders created policy groups to write recommendations for Democrats’ 2020 platform. Those committees unveiled 110 pages of policy plans Wednesday, ahead of Biden’s speech in Pennsylvania. They left Biden short of endorsing single-payer health insurance and the most aggressive timelines to achieve a carbon-neutral economy, but ratified his claims of a more progressive slate than his predecessors’.

Further, Biden already had moved toward Sanders’ tuition position, endorsing four years of full subsidies for most middle-class households. He adopted Warren’s proposed bankruptcy law overhaul and her ideas for a government procurement campaign to benefit U.S. companies.

Progressives promise continued pressure.

“I think our job is really to sometimes push him,” Washington Rep. Pramila Jayapal said. Jayapal, who helped lead the Biden-Sanders health care task force, said that means being “alongside him, of course, and then sometimes be out in front.”

Biden has managed party unity that wasn’t present four years ago.

“I don’t consider Biden’s proposals a political hat tip to progressives as much as rising to the moment we’re living in,” said Adam Green, co-founder of the Progressive Change Campaign Committee.