In 1988 for Dukakis it was Willie Horton.
In 2000 it was the "I invented the internet"
In 2004 it was SBVFT
I knew there would be something that the RWSM would come up with to trash Obama and bring him down. The RWSM game plan is all the same...figure out your weakness(es) in terms of the areas that the people are most worried about your leadership capabilities. Then find a situation that fits that issue and will resonate with swing voters...