LAST EDITED ON 01-02-09 AT 07:33 AM (EST)Checking TheFutonCritic.com it is coming on a 9pm on Sunday as well as 10 pm on Sunday because one hour alone will not contain the Donald's Ego.
If you need a two hour block there are only so many places on the schedule you can do that, and Saturday night isn't a good night for ratings. More people are home on Sunday night.
ETA: Desperate Housecritters is on ABC, and they aren't going to move it to 10 pm and move Brother and Sisters somewhere else just to make things easier for NBC to schedule things.
Generally the networks seem to like to schedule the good shows head to head so they can compete for ratings rather than spread them out. It is annoying.