If it is Mami, the only advice I have is... don't ask anything that can be too easily slanted? Like, obviously Rin's going to get to her first, and there's no stopping that Rin's a charming, manipulative cult leader. But at least give it as little fuel as possible. Like, on the one hand we as voters kind of want to know what "brought you here" means, but on the other hand... hrm.
...actually, that's the question. Are we asking questions so that we, as voters, know, or trying to ask questions that give Maybe-Mami-Maybe-Not the best chance not to get too hoodwinked (if that's at all possible.)
Whoever it is, the fact that they're meeting Lady Rin means there's a good chance that they will be our enemy at some point in the future, at least for a time.