Once you acknowledge your bias, you have a chance to resist it, though that, too, has perils.
"Based on what I’ve observed during the final months of this campaign, I believe Clinton is the favorite to win the general election. And so there is always a chance that I will (perhaps unconsciously) seek out patterns that confirm that prediction, or I will fail to spot evidence suggesting the opposite outcome. Conversely, now that I’ve acknowledged this bias, it’s possible I’ll overcompensate and swing too far the other way."
From Slate