The DeSart & Holbrook model is captured in the econometric models component of the combined PollyVote forecast. The model currently predicts a two-party vote share of 43.7% for Clinton, and 56.3% for Trump in Mississippi.
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 trusting the results from single models, one should use combined models or, even better, a combined forecast that draws upon forecasts from different methods, each of which draws upon different data.
The DeSart & Holbrook model in comparison with PollyVote's forecast
The latest PollyVote foresees Trump to gain 55.1% of the two-party vote in Mississippi. The results of the DeSart & Holbrook model for Trump are thus 1.2 percentage points above the combined PollyVote in Mississippi.