I guess that if Politifact was asked, they would say they aren't biased......
https://www.politifact.com/article/2018/nov/06/politifact-not-biased-heres-why/
Find ANYTHING that's based on human perception or research and you'll find some bias- it's part of human nature. "can't have any bias"? Anything can be biased- say hi to Santa, the elves and the Reindeer for me.
The poll wasn't conducted by them, but the link posted by Trell is from them.
Low margin of error in a 1300 member poll is still not large enough when >160 Million voters exist in the country. That's .000008125- hardly enough to gauge the whole country.