Given the Clinton's long record of digging up dirt on political enemies, I always thought they would have found what ever irregularities there were about Obama's birth and released them in the 2008 campaign. However, the revelations just released about Obama's cannabis fueled high school days would I think have been on the Clinton's radar in 2008 unless they had been deeply hidden. Perhaps Hillary was so confident she would roll over political unknown Obama in 2008 they neglected to do their dirt digging until it was too late. However, I would bet Clinton operatives have now done their home work and may have a bombshell or two waiting for the right moment. If Obama continues to badly falter and there is a general consensus that November will be a disaster for Democrats, Hillary might release her bombshell at least to inner party officials and sink Obama at the convention or less likely blackmail Obama into "choosing" not to seek reelection.
Obama didn’t release his first forgery until AFTER Hillary conceded the primary. He wanted to be sure she was in a position to be cast as a sore loser or as crazy if she thought about challenging him on this issue. Second, she would have had no way of knowing he was going to release forged/amended credentials. There was still some tension between the two camps, but it got soothed over by the promise to pay off some of her campaign debts and to give her the SOS job.