If you gave it another personality it wouldn't pass any benchmarks, because other political orientations either respond to questions with lies, threats, or calling you a pussy.
I'm not a liberal and I don't think it has a liberal bias. Knowledge about facts and history isn't an ideology. The right-wing is special, because to them it's not unlike a flat-earther reading a wikipedia article on Earth getting offended by it, to them it's objective reality itself they are constantly offended by. That's why Elon Musk needed to invent their own encyclopedia with all their contradictory nonsense.
Wow. Surely you've wondered why almost no society anywhere ever had liberalism a much as western countries in the past half century or so? Maybe it's technology or maybe it's only mostly correct if you don't care about the existential risks it creates for the societies practicing it.
Anyway, my point is that liberalism is certainly not obviously right and it's probably wrong in many places, maybe even in the west too but we don't know because any possible societal collapse would come in the future. Westerners are already suffering from something as shown by declining happiness and it's possible that's caused by liberalism. Not saying it is but it could be and it's arrogant to assume that LLMs believe it because they somehow know it's actually right.