I've just watched Jo Swinson on the Andrew Marr show. I'm a potential Lib Dem voter, so I'm sympathetic to many of her views, but I do find her voice very shrill and therefore off-putting. It gets more shrill as she becomes more indignant, and it sounds less authoritative than calmer deeper voices (of either gender). I think Margaret Thatcher famously went to a voice coach to teach her to talk lower and slower. I certainly find that when I talk slowly and calmly to my kids they're much more likely to do as I say.
I realise there will be many of you who would never consider voting LD, and more of you who will flame me for suggesting a tone of voice has nothing to do with whether you vote one way or another, but this is someone who is talking like she wants to take over the world, and she's going to need to use every weapon in her arsenal.