They are guilty by their own admissions. It’s called a statement against interest. Sestak stated what happened and no one in the Obama administration has denied it happened; and now Sestak’s brother comes out and admits he was just contacted by the White House.
There is plenty of evidence.
Sestak: “And on further reflection I misunderstood what the White House was saying. In fact they were saying that if the election doesn't go my way they had a job opening for me...”
End of story with no independent evidence. I'm not saying it is right. I just saying this is what to expect.