I can't imagine either ticket winning. Both a second Obama term and a Romney Presidency seem hopelessly unrealistic. The second one is easier to imagine than the first, and besides I would rather see the second than the first, so I voted Romney/Ryan, but I can understand claiming a second Obama term is likelier as well.
I have little idea what would
happen in a second Obama term, but I can see how we'd get there. I have a somewhat clearer (if, to me, horrific) idea of a Romney presidency, but I can't see how we'd get there.