John berman at the magic wall. How predictive have the Iowa Caucuses been . Not very. Not very at all for republicans. Looking back to 2016, you can see Ted Cruz won the Iowa Caucuses. Donald trump won new Hampshire Touchdown the nomination. In 2012 Rick Santorum won the Iowa Caucuses. Mitt romney won the nomination. John mccain won the republican nomination in 2008. You have to go back to 2000 to find where the person who won the caucuses was the nominee. That was george w. Bush who won 41 . He lost New Hampshire to john mccain. Iowa not a great predictor of whats to come