Fantastic! Do you know who would fill Zinke's House seat? He just won Montana's at-large House election, so who replaces him? Will Bullock be able to appoint a replacement?
I'm not sure who would run to replace him! It likely will be someone I have never heard of (I'm not extremely well versed in Montana politics). But perhaps Denny Rehberg, the former Congressman from Montana who lost a Senate race to Tester in 2012, would be interested in a political comeback and could try to run for his old seat.
Unfortunately Bullock will not be able to appoint a replacement, because it is a house seat. Governors can generally appoint senate vacancies, but this House seat will just remain vacant until a special election takes place. Not sure when that would occur.