Are The State Polls Skewed?

“Democrats’ odds of holding the Senate are declining based on the latest polls. But the race is close. Republicans are counting on narrow leads of just a percentage point or two holding up in some of the most important races, like those in Iowa, Colorado, Georgia and Alaska.
Last month, I examined the possibility that Senate polls could prove to be biased or “skewed” against Democrats. If the polls have even a modest bias against Democrats, the party’s chances of keeping the Senate would be more like 50-50. And if the polls have a more severe anti-Democratic bias, it would be favored to keep its majority.”