Another poll out today has Trump up by one - too close to call and too soon to see the Palin effect if any.
The other poll was the Loras poll which was taken the 13th through the 18th so I think the KBUR poll taken the 18th through the 19th is a better picture of where this fast moving race stands now.
However, you are definitely right that this race is incredibly close. Many Trump supporters were suggesting that Iowa was over with the Palin endorsement and that is definitely not the case since Cruz leads in the KBUR poll which was taken largely after her endorsement.
Yes, too soon to see how much Palin’s endorsement hurts Trump.