"Reality has a liberal bias" referred to "liberal" as the opposite of "conservative" which is identical to "right wing" - reality has an anti-right-wing bias.

"Reality has a liberal bias" referred to "liberal" as the opposite of "conservative" which is identical to "right wing" - reality has an anti-right-wing bias. Actual political factions are more nuanced than that, but you have to dumb it down for a wide audience.