Dear everyone: the sitting president appoints ALL federal judges, in all states. There is nothing to gerrymander. Edited to add: necessarily almost everything must be split from CA, due to the much larger number of judges. CA9 is the only Circuit that hears "en banc" without all judges, because there are 29 seats. Even stripping alway 6 states, CA, OR, HI, and M.I. leave the 9th with 19, the new 12th with only 10.