How does MS special election law work? For Cochran's seat, the best case scenario for the MS GOP is likely to have Cochran hold out until 2020 to retire and then have the open seat race with Trump at the top of the ballot. The worst case scenario would seem to be a special sometime in 2019/20 where the open senate seat is the only thing on the ballot and McDaniel runs. Given that there is a statewide GE every year in MS, would the MS GOP prefer to have the extra senate seat on the ballot in Nov 2018 or have it coincide with the Gov and state legislative races in 2019?
If I were the MS GOP, I would prefer it be in 2019 so the race would share the ballot with the MS GOV race.