(Mark Su for Congress, November 3, 2025) Mark Su filed his petition on the last day of petition period, November 3, 2025, and he filed it in 4:15PM, which will be put on ballot placement lottery.
On November 3 Mark Su for congress campaign team drove 4 hours from Chicago to Springfield, arrived Illinois State Board of Election at 3:15pm, where Mark Su met crowded candidates, include Republican candidates from Chicago areas, governor candidates, US senator, US House candidates, and state representative candidates.

The petition filing is a milestone for Mark Su for Congress campaign. From August 6 to later October , within 3 months petition signature period, Mark Su and his campaign team visit 9th district to collect signature, include Chicago Lincoln Square, Uptown, Edgewater, Rogers Park, suburb Evanston, Skokie, Wilmette, Park Ridge, and met ang greeted thousands of 9th district voters and citizens.
Mark Su for Congress thank all petition signature support from 9th district, this make Mark Su candidacy formally show on next Primary ballot, which will be on March 17, 2026, early vote start February 5, 2026.

