538 factored in convention bounce and bias and found that they still have Trump up 1
You mean 538 is unskewing polls now? How far Nate Silver has fallen.
No, they adjust (and always have) for the "house effect" of a pollster. For instance, if you have a pollster who routinely gets Republican-favorable results in states with a lot of polling (like Ohio), and it's the only pollster active in a less-polled state, they'll adjust for that fact. It's a totally reasonable method of normalizing state results, so one candidate isn't arbitrarily favored in the prediction just because certain pollsters were the ones active in that state.
