The DeSart & Holbrook model is part of the econometric models component of the PollyVote forecast. According to the model, Clinton will collect 42.6% of the two-party vote share in South Dakota, while Trump will win 57.4%.
Putting the results in context
In general, however, don't have too much faith in the results of single models, as they may incorporate large errors. Rather than relying on results from single models, you should look at combined models or, even better, the combined PollyVote forecast that relies on different methods and data.
Comparison to the combined PollyVote
The latest PollyVote foresees Trump to gain 59.0% of the two-party vote in South Dakota. The results of the DeSart & Holbrook model for Trump are thus 1.6 percentage points below the combined PollyVote in South Dakota.