Denver school board member Rosemary Rodriguez said Wednesday that she is not running for re-election, putting her southwest Denver seat up for grabs in what will likely be a contentious school board campaign this fall with control of the board at stake.

Rodriguez told Chalkbeat she is retiring from her job as senior advisor to Democratic U.S. Senator Michael Bennet and plans to sell her home and buy a smaller one that belonged to her grandparents.

That home is not in her school board district, District 2, but in the district represented by board member Lisa Flores. With the exception of at-large members, Denver school board members must live in the districts they represent.

“If it weren’t the case, I would still be running,” Rodriguez said.

During her four-year tenure, Rodriguez worked with community groups and others to spotlight student achievement in southwest Denver, leading to new schools and better transportation.

Former Denver Public Schools teacher and Denver native Angela Cobian announced Wednesday that she is running for the seat. Rodriguez has endorsed Cobian, a political newcomer who works for the nonprofit Leadership for Educational Equity, which helps Teach for America members and alumni get involved in politics and advocacy.

All seven current board members support Denver’s nationally known brand of education reform, which includes a “portfolio” of traditional district-run, charter, magnet and innovation schools.

With four of the the board’s seats up for grabs this November, the campaign presents an opportunity for opponents of those reforms to again try to get a voice on the board.

The field is still very much taking shape. The most competitive race so far involves District 4 in northeast Denver. Incumbent Rachele Espiritu, who was appointed to the seat last year, announced her campaign earlier this month. The board chose Espiritu after its initial pick, MiDian Holmes, withdrew after a child abuse case came to light and she was not forthcoming with all the details.

Also filing paperwork to run in District 4 is Jennifer Bacon, who was a finalist in the process that led to the board picking Espiritu. Auontai “Tay” Anderson, the student body president of Manual High School, declared his candidacy for the northeast Denver seat in April.

Incumbents Mike Johnson and Barbara O’Brien have not yet filed election paperwork with the state. Two candidates have declared for O’Brien’s at-large seat: Julie Banuelos and Jo Ann Fujioka.