The DeSart & Holbrook model is part of the econometric models component of the PollyVote. The model currently predicts a tie, with each candidate ending up with 50% of the two-party vote.
Historically, Iowa has been a swing state, in which no single party has had overwhelming support to secure that state's electoral college votes. This is why predictions in this state are of particular importance.
Putting the results in context
As any other method, models are subject to bias. As a result, don't have too much faith in the results of a single econometric model. Rather, one should examine how a model's results compare to benchmark forecasts.
Results compared to the combined PollyVote forecast
The most recent PollyVote predicts Clinton to gain 50.5% and Trump 49.5% of the two-party vote in Iowa. Clinton has 0.6 percentage points less when the results of the econometric model are compared to the combined PollyVote forecast for Iowa.