Three topics I'd love to know more about:
1. How many people know that Healthcare.gov is Obamacare? Especially the people who actually use it. Also, the associated questions: how many know that it's the Affordable Care Act, and how many know that there's more to the ACA than the exchanges? I'm assuming that the number of people who associate Healthcare.gov with Obamacare is higher than it would have been if it had worked smoothly from the start...I'd expect the number to be relatively high now, and start to shrink as time goes on. But either way, I'd love to know about it.
2. How many people know that the US is still involved in a shooting war in Afghanistan? How many know that the US is no longer involved in a shooting war in Iraq? I saw another reference today somewhere to "two wars"...I suppose that might have meant Afghanistan and the general "war on terror," or it could have been just a error while writing quickly, or that there was an implicit "over the last decade" that I didn't read properly, but really I have no idea. I'm fairly certain that some people think the US is still occupying Iraq, and that some people don't know there are still US troops (and US casualties) in Afghanistan, but whether it's a tiny fraction or something more substantial? I have no idea.
3. An old standby: What do people mean when they talk about the "deficit"? Or, to put it another way: what do people hear when pollsters ask them about the deficit?
Generally: I find myself curious about political knowledge (in the electorate, but sometimes among elites) at least as often as I am curious about political opinions. That might just be because there's plenty of available information about opinions and much less about knowledge; I can't tell.
This worked once! So: Hey, pollsters: I bet I'm not the only one curious about these things.