The committee, Illinois Justice & Public Safety PAC, filed an independent expenditure report this afternoon. It disclosed plans to spend $444,415 on digital and TV ads and direct mail opposing Conway.

In a statement, Conway's campaign said, "Bill's message of enacting balanced criminal justice reform, getting after our gun crime epidemic, and getting politics out of the State's Attorney's Office is resonating across Cook County, and apparently Kim Foxx and her friends finally realized it. While we're certain they'll sling all kinds of lies over the coming month, we're confident that voters will see through it and elect the only progressive, prosecutor, and veteran in this race—Bill Conway."

The PAC has not yet disclosed donors, but a similar fund that opened and then closed during Foxx’s 2016 bid offers some clues.

It had a similar name—Illinois Safety & Justice—and the same chair, Whitney Tymas. It used the same media firm, New York-based Berlin Rosen. That super PAC raised $700,000 to support Foxx in her 2016 bid against Anita Alvarez.

Tymas did not immediately respond to a request for comment.

In the 2016 race, Illinois Safety & Justice raised $400,000 from progressive megadonor George Soros and the rest from the Civic Participation Action Fund, the “501(c)4 arm of The Atlantic Philanthropies . . . that supports high-impact civic engagement efforts addressing racial and economic disparity.”

A similar fund chaired by Tymas and backed by Soros spent heavily in county prosecutor races in Virginia last year, according to the Washington Post.

The boost helps Foxx match Conway’s media blitz in recent weeks, aided by $7.5 million in donations from his father, Carlyle Group co-founder William Conway.

Sources close to both campaigns suggest the race is still up in the air with a month left to go, with Foxx damaged by the fallout of her handling of the Jussie Smollett case, and Conway a political unknown. Both sides say the battle will likely come down to white progressive voters. Other candidates Donna More and Bob Fioretti continue to lag in polls, both say.

While voters have heard about Smollett for close to a year—with another reminder landing this week, care of special prosecutor Dan Webb—Foxx’s camp suggests voters have not heard much about Carlyle Group, which could prove to be a game changer in the remaining weeks.

Foxx won the endorsement of presidential front-runner U.S. Sen. Bernie Sanders of Vermont today, and U.S. Sen. Elizabeth Warren of Massachusetts last week.