Union-backed challenger Melinda Doucet has defeated incumbent and business candidate Mark Jacobs, winning 52 percent of the vote to Jacobs’ 48 percent, with all 33 precincts reporting in the District 7 race for Jefferson Parish School Board.

Coupled with Rickey Johnson’s defeat of business-backed challenger Rickeem Jackson, the win gives union-backed candidates a slim majority of the school board seats.

The two races were closely watched as the agendas of two competing interest groups lie in the balance.

With only one exception, board members are either backed by business groups or the teachers’ union, and the last four years have seen business-backed candidates enjoying a majority.

Jacobs and Doucet each got about 45 percent of the vote in the Nov. 4 primary.

Follow Chad Calder on Twitter @Chad_Calder