Only seems fitting since Fox only became Attorney General in the first place because Bullock left his seat open in 2012 to run for governor. I think he owes Bullock this one, and besides Fox's chances are a lot better to run for governor in 2020 when Bullock's term-limited.
I just hope Zinke or Racicot also stay out of this race. Bullock's doing a strong job as governor especially in improving Montana's school system and he definitely deserves a 2nd term.
I think Zinke will wait on running for another office, and aim for Tester in 2018. No clue about Racicot.