If Hillary Clinton has more of the popular vote than Senator Obama at the end of the process, it could hardly be labeled a coup if the superdelegates overturn the verdict of the pledged delegates.
More voters, after all, would have VOTED for Clinton than Obama. Just as more Americans voted for Al Gore in the 2000 election.
The delegate count is mere semantics, the preference of the voters is what matters. Obama should concentrate on beating Hillary in the popular vote.
Incidentally, he may have trouble doing so, as Hillary has the clear momentum, and only needs 56% of the remaining votes to be ahead in the popular count.