Mark today on your calendar - it's the day the media fell out of love with Herman Cain.
If you're keeping score here, you'll notice that these things run in a cycle of a few weeks. For a few weeks the media falls in love with a candidate and then they slash him or her to pieces in matter of days once they've had enough of them. Rick Perry got his turn on that ride directly before Cain, and Bachman was before Perry. I suspect Gingrich is too damaged already to take ride and Santorum is just a joke. That leaves Ron Paul and you aren't going to hear the press bring him up if they don't have to. Oh wait!! John Hunstman... well, if you forgot about him like I just did, that says a lot about him.
Cain leads in several polls today, but you'll see that go away by Thursday and Romney will be back on top. If you want to make a projection on who the nominee is going to be, I guess you just look at who has had the most consistent performance. That would be Romney - always first or second.