I’m hoping someone here has some ideas about questions designed to determine which political party someone favors.

My local Democratic party has an idea I like a lot: figure out which unaffiliated voters are dem-leaning and add them to our GOTV efforts. We already know about some of them (about 20% I think) but there are a lot of blanks.

So we would like to go ask them. But independents don’t want to be asked if they are dem-leaning. They get affronted and say they vote for the candidate, not the party. And we don’t want to be too confrontational either. A question about whether they favor a wall to keep out immigrants would probably work, but it would also cause unpleasant interactions. These are volunteers we asking to figure this out - they shouldn’t have to be yelled at unnecessarily.

So we would like to figure out some questions that are reasonably pleasant but pretty good at sorting out who will generally vote for Democrats. I feel like I have seen something like this before, but I am not finding it. Any ideas?