So many people seem to think the results being close make no sense...
You do realize that Shirogane pretty much campaigned for her?
And I'm not talking about getting her to talk (though that was something as well, she wasn't saying anything), I'm talking about helping her put her strong points under the spotlight...
He appeared to be "against her", while he was asking questions he KNEW she had all the answers for, and that it would look good for HER.
To put it in perspective... Imagine you're a candidate at an election against the currently elected official (ending his first term), and you ask him questions about crime rates and the like, when he actually did a tremendous job to lower the crime rates all over the country; You can be as aggressive as you want with these questions, it'll only help him, because you're throwing him softballs that he can all hit well because he has all the answers.
In a political debate, you don't question your opponent on things that make him look good... You question him on things he has no answers for, or answers that will turn a lot of people against him.
If you watched the democrats debates, the mediators are ALL throwing them softballs (because they're all leftist and don't want Trump to win). They don't pressure them, they don't ask tough questions or pure for more information when the candidate is in trouble, etc. They only want to make them look good, so they have a great chance against Trump.
Well, that's exactly what Shirogane was doing with Miko; He was making her look good.