LAWRENCE, Mass. (CNN) - Sen. Elizabeth Warren officially launched her 2020 presidential campaign Saturday at a rally in Lawrence, Massachusetts, using the backdrop of Everett Mills -- the site of a historic 1912 labor strike led by women and immigrants -- to issue a call to action against wealthy power brokers who "have been waging class warfare against hardworking people for decades."
Over 44 minutes in sub-freezing temperatures, Warren described a political elite "bought off" and "bullied" by corporate giants, and a middle class squeezed so tight it "can barely breathe."
"The man in the White House is not the cause of what is broken, he is just the latest and most extreme symptom of what's gone wrong in America," Warren said of President Donald Trump. "A product of a rigged system that props up the rich and powerful and kicks dirt on everyone else. So once he's gone, we can't pretend that none of this ever happened."
The formal start of Warren's White House campaign comes as the Democratic primary intensifies by the day, with numerous candidates including Sens. Kamala Harris and Cory Booker already in the race, and others, like Sens. Bernie Sanders and Amy Klobuchar, expected to jump in soon. Trump's 2020 campaign manager welcomed Warren to the race with a statement predicting voters "will reject her dishonest campaign and socialist ideas like the Green New Deal."
In a warning to some of those rivals, Warren touted her refusal to accept donations from lobbyists, corporate PACs or the support of super PACs, and challenged "every other candidate who asks for your vote in this primary to say exactly the same thing."
Warren also unveiled a new, high-profile backer in Rep. Joseph P. Kennedy III, who introduced, endorsed and painted his former professor a prescient political voice.
"Before there was an editorial every day lamenting economic inequity, Elizabeth Warren knew that stock prices don't tell a full account of our country's economic story," Kennedy said. "Medical bankruptcies and foreclosures and paychecks are part of that story, too."
Kennedy led a Massachusetts delegation that included Sen. Ed Markey, Rep. Lori Trahan, Lawrence Mayor Dan Rivera and Boston City Councilor Michelle Wu -- all of them indicating their support for Warren's campaign.
"For six years, (Warren) has been fighting in the trenches for what is right," Markey said of his Senate colleague, calling her a "one woman protection detail fighting to ensure that Wall Street reforms stay on the books."
Warren was joined by family, including her husband, Bruce, two children and a gaggle of grandchildren.