No, it's not.
Iowa doesn't mean anything in terms of delegates, but it gives a candidate momentum.
Again, who was initially crowned the winner of Iowa in 2012?
Who actually won Iowa in 2012?
It's all about perception, which is what I've said before. Iowa isn't actually important, except that people think it's important, so it is important. It's the first real contest of the presidential election, and leads directly to NH.
Obama, who was the underdog to HRC, won Iowa and proved he could win elsewhere (minus the massive amounts of in-person voter fraud committed by hispanic preteens with calves the size of cantaloupes, aided by time-traveling Vincent Foster and the entire cast of Benghazi!).