Chang was sworn into the House of Delegates on January 14, 2015. He has been a member of the Appropriations Committee during his entire tenure, including as the committee's vice chair from 2021 to 2025. On December 5, 2023, Chang announced that he would
run for Congress in
Maryland's 3rd congressional district, seeking to succeed retiring U.S. Representative
John Sarbanes. He was defeated in the Democratic primary election by state senator
Sarah Elfreth on May 14, 2024, placing fifth with 5.0 percent of the vote. In February 2026, Chang announced that he would run for the
Maryland Senate in
2026, seeking to succeed state senator
Pamela Beidle, who had announced her retirement hours before the candidate filing deadline and endorsed Chang to succeed her. During his campaign, he said he would prioritize protecting state investments and assisting families facing economic strain, especially those affected by cuts to
Medicaid and
Supplemental Nutrition Assistance Program benefits by the
One Big Beautiful Bill Act. ==Political positions==