Unless they have the votes to override (which I doubt) the rat Governor will just veto it.
From another article it states the Republicans have a super majority in both chambers but are still 4 votes short.
Because the bill would put the matter before voters, Gov. Jay Nixon (D) would not have the opportunity to use his veto pen.
If the bill authorizes a vote of the people, the governor is not involved. Depending on specific wording, the legislation would either assign the vote to the August primary, or authorize the Governor to choose when the vote is held. Believing November would be the better chance to defeat RTW, our governor would probably choose the November ballot.
Either way, the bill(s) still have to pass both houses of the MO legislature by mid-May, when this year's session ends.