The only, truly interesting thing about the dueling Romney-Biden NAACP appearances is the man who was absent from the show. Obama.
As with Sherlock Holmes' dog that didn't bark, the interesting thing about this is the case of the Barack that didn't show up to bark, deliver a few jokes, remind everyone that he is the epitome of the NAACP's accomplishments-- including white people who might be considering casting their vote somewhere else.