I think Josh Patashnik actually makes a pretty good case that Obama should let Clinton seat Florida, giving her a middling delegate bump that avoids a big momentum boost, rather than supporting a re-vote which will give her a smaller delegate bump that comes with a ton of additional momentum right before the convention. Since the Clinton campaign was successful in arguing that something needed to be done to change the original rules they agreed to abide by and abandoned when they fell behind in delegates, Obama may want to do the something that denies them a legitimate win in Florida.