Somewhere shortly before the election, Obama consigliere Kommisar Valerie Jarret went off on a rant saying that after the election the administration was going to settle scores with any and every person that criticized, objected to, or stood in the way of anything the administration wanted or did.
Lots of historical tyrants and despots have engaged in just such activities before. Hitler settled lots of old scores along with the main items on the agenda, the Night Of The long Knives.
Obama knows that in nominating John Francoise"American soldiers in Vietnam acted like the forces of Genghis Kahn" Kerry would arouse members of the Swift Boat Veterans For The Truth, much as Kerry's Presidential candidacy did in 2004, to come forth where he could destroy them settling an old score for the Democrats from 2004. Nominating Susan Rice for Secretary of State would put both Sens John McCain and Lindsay Graham in positions where Obama could destroy both men simultaneously and send a potent message to any and all who might choose to oppose him in the future.