Running Rut

I have a question for all of you runners out there.

What do you do to get yourself out of a rut? What motivates you to run when you can't find motivation?

I'm signed up to run a half marathon in just over a month and I'm really struggling lately with finding the motivation to do my training. You'd think that the fear of having to run 13.1 miles would be enough motivation, but sadly, its not.

I think part of the problem is that I was hoping the running would help me to shed some (all) of the baby weight and at this point, its not happening. So now I'm plodding along (unmotivated) and not losing weight. Ugh. I seriously thought that as I got back into shape and started losing weight that the running would become more fun. What is the problem here?

Please help me!