I think it should be fairly obvious that the purpose of the meeting is important. Knowing why you're compiling a list like this can inform the nature of suggestions. For instance, are these agenda items that might actually make it to the president's desk? Or are these things he intends to focus on for the campaign trail? Or are you just adding one more voice to a chorus of complaints just because you can? Or is it something I haven't thought of?
The answer to your initial question varies a lot depending on the scenario of the meeting. Is this representative of the Obama campaign meeting you because she feels you have something to bring to the table, or because she feels that you're someone she needs to placate? Will this meeting be cooperative or combative?
To some extent, the answers to these questions will decide whether I'd like to participate in your survey at all, but to another extent, they actually do have an effect on the answers you're going to get. For instance, if the items you discuss have the potential to actually affect Obama's political agenda, I'd be a lot more likely to talk about the Citizens United ruling (against which action can still be taken) than I would be to complain about NDAA (which is already signed into law, and therefore too late to change).
If you're talking about campaign points, then it would be more productive to talk about issues which have been slowed or blocked by an uncooperative partisan congress, such as budget approvals, tax increases, and the health care bill.
In short: context matters. And if you're not willing to reveal even the most general details about what sort of meeting you're planning, then I'm afraid you're not likely to get much more help (at least, not in the next twelve hours, or however long it is until your meeting) than you've gotten already.