an election that is held when a lawmaker dies, resigns, or is expelled from office in mid-term
And that means Gov. Chris Christie will need to appoint a successor until a special election, likely to be held this November.
They would all have free runs since they would not have to give up their seats to participate in the special election.
If Coburn resigns as announced, it would lead to a special election for his Senate seat in deep red Oklahoma.