The board is expected to decide next week whether to shorten terms of current senators to reflect changes in their districts. A final redistricting plan is due by June 14.
The board has been working for months to redraw political boundaries based on population data from the 2010 Census. The census showed southeast Alaska among areas losing population while the Mat-Su Borough was among the state's fastest-growing.
Under the plan approved this week, the Mat-Su will gain a House seat and southeast Alaska will lose a House seat and half a Senate seat. That means that Reps. Kyle Johansen and Peggy Wilson would have to run against each other if both sought re-election.