The DeSart & Holbrook model is captured in the econometric models component of the PollyVote forecast. The model currently forecasts a two-party vote share of 43.7% for Clinton, and 56.3% for Trump in South Carolina.
Putting the results in context
Single models may include large biases, and should be treated with caution. Instead of trusting the results from single models, you should consult combined models or, even better, a combined forecast that incorporates forecasts from different methods, each of which draws upon different data.
Comparison to the combined PollyVote
The most recent PollyVote foresees Trump to gain 54.4% of the two-party vote in South Carolina. The results of the DeSart & Holbrook model for Trump are thus 1.9 percentage points above the combined PollyVote in South Carolina.