That's a good point and a good question for some super computer
When the choice crystalizes as one between 'he's too old' and 'the other guy crimes way too much', we'll see what the polls say to that
Maybe, question could be: With complex and compounding issues in advance of the election; How or What do you think is the main issues that will crystalize into how some will vote this election?. Please help with that one.
I know, from past polls that determined elections and now we still see the economy seems to be #1. But of course, people can't do math.