Re: Biased court
They're most reversed due to being the biggest, mostly. Whether they have the highest reversal *rate* depends a lot on what terms you look at -- you could also make a case for the 3rd, 6th, or the 11th.
The 9th's reversal rate tends to get highlighted by conservatives in the US because it's perceived as the most liberal circuit -- it's their way of arguing that decisions they don't agree with are invalid.