To The Bank

If it's really true, as many people are saying, that Barack Obama has a "bank" of 2-3 dozen superdelegates prepared to endorse him then wouldn't this weekend be a good time to start making withdrawals? The literal impact of him getting a bunch of superdelegate endorsements today and tomorrow in order to ensure that the primaries on Tuesday and Wednesday put him over the finish line, and him getting a bunch of superdelegate endorsements that put him over the line on Thursday and Friday is identical, but on a symbolic plane it seems to me that you want to clinch things with an election result rather than an endorsement announcement.