I think that Trump will win OK. The poll was taken before NH and the variance is within the MoE. Meanwhile, I think Rubio will finish 2nd in SC. Cruz is up against some headwinds. We shall see.
IF it’s from before the big win in NH it’s stale. Lot of people may take it as a sign he’s for real.
I believe Cruz’s ground game will ensure he comes in second. Of course, no one including Trump, Cruz, etc can have a bad debate performance. If Rubio slips up it is over for him period. Bush nor Kasich can have a bad performance and continue in the race. Cruz and Trump would be hurt but not knocked out unless it was unforgivably bad.