Except Wikipedia's bias goes far, far beyond "objective truths". There's not a lot of objective truths in politics, since politics is inherently subjective matter, but reading Wikipedia articles on political subjects systematically you will discover very quickly it has very distinct political makeup, which is quite one-sided, and if you even meet the admins or prominent editors, you'll also recognize the same political makeup. You may agree with them, but that doesn't make it "objective truth" - that just makes one more person with that opinion.