Well if its 25% to 23% on caucus night Cruz will lose by 2pts.
Mighty Mo.
The Caucus doesn't work that way. You have to have multiple committed delegates in each of the 99 counties and in each of the vastly more precincts. If Trump is not highly organized and Cruz is, Cruz will still beat him even if the polls remain 25-23. You can't participate if you're an independent or a disgruntled Democrat, and Iowa has a long tradition of Caucus night where the people most interested and with political know-how have the upper hand and can turn back someone else even though they have better popular support. I would bet lots of the Trump supporters have never even been to a caucus.
2012, Romney vs. Santorum, one of them "won" the popular vote, the other won the delegates.
Well if it's the yesterday's released Yougov/cbs poll on caucus night Cruz loses by 9 pts.
Oh yeah new national poll about to come out. This is what it looks like. ;-)