FOX has been notoriously inaccurate in polling, like most of the polls by major media sources. In this one most recently on Americans for/against impeachment, they once again over sample Democrat voters and get a predictable slim 51% majority favoring impeachment. FOX also had Clinton winning Michigan by 4% in 2016, over sampling Dems by 5%, FOX had Clinton up by 4% in Florida but had an even sample in that poll, in Pennsylvania I don't see a FOX poll after April but the rest had on average Clinton up almost 3%. In Ohio, FOX doesn't keep that poll any more, but they had Trump up by 5%, he won by 8%. In Wisconsin FOX had Clinton up by 14%, but that was in March, the average had Hillary winning by more than 6%, and Trump won that state. Iowa polls on average showed Trump winning by 3%, but he won that state by 9.5%. FOX doesn't have polls available for that state on RealClearPolitics. In North Carolina, FOX had Trump up by 5%, the average had him barely ahead by less than a 1% margin, but Trump won by 3.6%. FOX poll no longer available. In Arizona, Virginia, and Nevada were all within a 3% margin. So, if we average the accuracy of these ten swing state polls, FOX had an accuracy of being skewed 4% in favor of Democrats and usually this is due to over sampling Democrats, while national polls were off, on average by about 6% in swing states. The Trafalgar Group had the most accurate polls in swing states that they did poll, all of them within a 3% margin of error compared to actual vote results. So when you read a FOX poll about trump, give him another 4% and if it is a major media poll, give him 5% and you are more likely to get something accurate.