One of several complicated measures on which I am expected to vote tomorrow:

California’s very expensive drug price battle: Prop 61 fight gets even nastier

Major pharmaceutical companies have been pouring massive amounts of money — $109 million and counting — into California to urge voters to say “No” to Prop 61, which if passed Tuesday would largely bar state agencies that cover about 5 million people for paying any more for prescription drugs than what the federal Veterans Affairs Department pays.

There are so many possible twists and turns to a ballot measure that proposes a major new law.