As it stands now, it appears that this measure is likely to pass. A reliable source indicates that as of today well over 50% of Arizonans are in support of Prop 139 (which means they are voting YES)
What is Prop 139? It is the measure that would eliminate further safeguards and regulations on abortion, and would allow for abortions to happen up until birth. Currently in Arizona abortions are only allowed for up to 15 weeks.
To understand Prop 139 further, read this article HERE