How do we know that they used the likely voter model to estimate the 2016 turn out in this poll? That's pure speculation in my view and probably false. Why couldn't they have asked all respondents this question? After all, they don't estimate the likely voter turnout until after the poll has been executed. When they ask a question related to 2016, there's no reason they'll spend heaps of resources to use a 2014 electorate to calculate such an outcome instead of just using the raw numbers.
"PPP surveyed 1,266 likely voters from September 11th to 14th."
And since the focal point of the poll is the senate race, the likely voters are of the senate race.
