The Holbrook model is included in the econometric models component of the combined PollyVote. It currently predicts a two-party vote share of 52.5% for Clinton, and 47.5% for Trump.
Putting the results in context
As a general rule, however, a good strategy is to not have too much faith in the results of single models, as they may incorporate large errors. At least, one should examine how a model's results compare to benchmark forecasts.
Results compared to other econometric models
Looking at an average of econometric models, Clinton's two-party vote share is currently at 50.0%. In comparison to numbers in the Holbrook model Clinton's econometric model average is 2.5 percentage points worse.
Results compared to the combined PollyVote prediction
The current PollyVote predicts Clinton to gain 53.5% of the two-party vote. The results of the Holbrook model for Clinton are thus 1.0 percentage points below the combined PollyVote.