“Obama calls Sestak a liar. Time for Sestak to tell all.”
Bingo! If “nothing improper” took place then Sestak is a liar. Let’s see how he reacts to getting thrown under the bus.
(Actually, he needs to worry about literally getting thrown under a bus...)
In that role, Obama is his new ally and can hold one or two fundraisers to shower millions on him or say the word and bury him completely.
Sestak is going to do his best to obfuscate, change the subject, give circular answers, and run out the clock until November.
The GOP has to hammer him everyday for the full story. He won't tell it, but at least we can make him lie on the record.