Former Commerce Secretary Penny Pritzker Penny Sue PritzkerThe Hill's Morning Report - Sanders steamrolls to South Carolina primary, Super Tuesday Biden's new campaign ad features Obama speech praising him Obama Commerce secretary backs Biden's 2020 bid MORE endorsed Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE's Democratic presidential bid on Wednesday, citing his leadership and "incomparable domestic and foreign policy expertise."

"During the Obama-Administration, I was fortunate enough to work closely with Joe Biden and witness, firsthand, Joe’s leadership and ability to deliver for working families," Pritzker, who served in former President Obama's Cabinet while Biden was vice president, said in a statement.

“With incomparable domestic and foreign policy expertise, I can think of no one better prepared for the job of President of the United States than Joe Biden. He will be a commander-in-chief that will make all Americans proud, and he will rebuild our alliances to make our nation once again respected across the world as a beacon of hope, opportunity and freedom. I am incredibly proud to endorse him for President," she continued.

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Pritzker, brother of Illinois Gov. J.B. Pritzker (D), first joined Obama's presidential campaign in 2007 after being active in Chicago politics for years, including serving as a member of Chicago's Board of Education, and was a member of the board of the Museum of Contemporary Art Chicago.

Her endorsement comes after another Obama-era official, former Housing and Urban Development Secretary Julián Castro, recently endorsed Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE's (D-Mass.) presidential bid after ending his own campaign.

Despite lagging in some early voting states, Biden, who has stressed his ties to Obama, remains the front-runner for the Democratic nomination with most national polls showing him ahead of contenders such as Warren and Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.).

The Biden campaign also announced endorsements from a group of female state lawmakers in Ohio, including Reps. Allison Russo, Kristin Boggs, Randi Clites, Tavia Galonski, Michele Lepore-Hagan, Mary Lightbody, Jessica Miranda, Lisa Sobecki and Bride Rose Sweeney.

"This all-female group of endorsers will play key roles in the campaign’s Women for Biden grassroots movement—a national network of supporters working to connect and organize other women to help get Joe elected because of his unmatched record fighting for women’s health care, paychecks, safety, and families," the campaign said.

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In a statement, Russo pointed to Biden's support for ObamaCare as a reason for her endorsement.

“Vice President Biden was instrumental in passing the Affordable Care Act, and has always championed for working families. His commitment to improving the health care, education, and economy for every community in Ohio and the country will pave the way for my children, and other people’s children," she wrote, adding: "That’s why I’m proud to endorse Joe Biden for President.”

— This report was updated at 10:06 a.m.