At best, his actions have been, at times, a bit morally ambiguous. At worst, he's a sneaky little shit.
The fact that a whole lot of people share this view of Alex tells me that the editors are deliberately giving him this image. We keep seeing lots of shots of Alex pulling his little faces. There's no way he's going to win.
Claire on the other hand, has been so flattered by the edits, including the interviews today where she seemed to perform better than the others, that I can't see how she WON'T win. It's being set up so that we want her to.