I guess they figured that people weren’t buying the national poll they came out with that showed Cruz ahead of Trump, so they are now floating this one showing Trump ahead by just a little.
I also think that Kasich performs far better than expected, especially since he hasn't really focused on SC. I also think Carson performs slightly better than polling, because I think some Cruz voters will wander over to him.
I'm rooting for Little Jebbie to stay in. I don't think any of them drop out.