Hard as it may be for some Republicans to accept, Fox News is one of those groups that engages in flawed polling. It contracts with Daron Shaw, a Republican who opposed Trump in the ’16 primaries, and Anderson Robbins Research, a Democratic polling outfit.
Consider that Fox News showed Biden with a double-digit lead (see its methodology here) weeks before NBC/WSJ and Quinnipiac released their surveys. Four years ago, Fox News featured a 10-point lead for Hillary Clinton (with same methodology that it uses today); this closed to two points by early November. Was the electorate so elastic that it underwent near-10-point change in a matter of weeks?
Fox News also showed Republicans losing not only the governorship, but the U.S. Senate race in Kansas during the 2014 midterms (on the basis of the same methodology that it continues to apply). The Republican gubernatorial nominee won by four points while the GOP’s senatorial candidate achieved an 11-point victory.
Above all, keep 2016 in mind. Polls inaccurate, T-man won.