The race for the Presidency begins in Iowa, with the caucuses in early January of the election year!
But Iowa has never been a true indicator of the future of a Presidential candidate, and the tendency has been, in the Republican Party, to have one of the most extreme right wing candidates win Iowa, and then collapse over time, and one can say, thank goodness for that!
So in 2008, Mike Huckabee won in Iowa.
So in 2012, Rick Santorum won in Iowa.
The likelihood is that someone as extreme and divisive as Huckabee or Santorum, both of whom are testing the waters to run for the Presidency again, will win Iowa in 2016, and again, make it a totally irrelevant event!
Expect that one of these two past winners of the Iowa Caucuses wins it again in 2016, but also Ted Cruz, Rand Paul, Dr. Benjamin Carson, Bobby Jindal, Scott Walker, and Rick Perry have a shot at winning, while Jeb Bush, John Kasich, Marco Rubio, and Chris Christie have no chance of winning Iowa, but all to the good long term!