Wow. So literal.

So let's talk 2016 presidential election

I'd imagine that a Trump Voter's ballot would look like the following if Sanders had run as an independent.

1) Trump 2) Sanders 3) Gary Johnson (Maybe with a flip on 2/3)

Clinton voters would be

1) Clinton 2) Sanders

Neither primary choice would be acceptable to the other. There would be some voters who preferred Sanders first.