Humm ok that's so controverse. We need real and strong informations. Why they never could doing a general poll in one Party and not only made with people they've choosen?!
It's that one of the way how medias can manipulate the population. I think they should use blockchain for them votes and poll to have better overview and (ainsi) reduce diffences and inequity and thereafter giving informations. Because It's about president, democracy and population.
If I was a pollster instead of doing just the first randomly selected I'd keep going until I found my first five hundred democrats then my first five hundred republicans or you could reduce both groups equally by choosing to allocate whatever percentage of independents, libertarians are estimated in your state. Still overall though I don't think asking any group of one thousand any way you mix it to be a good representation of the overall population of any state.