And the political leaning of those in the organizations doing the polling/surveying?
I have read that the 1994 NHLS survey is accepted as the gold standard in legal circles.
As for Gallup, well, yes, I know most everyone on FR are hugely distrustful of polls. But I look at the landscape of the U.S. and I see it reflected in these polls, i.e., acceptance/tolerance of issues that were once considered bad behavior.