CHARLOTTE, N.C. — President Obama has met his own worst enemy, and his name is Barack Obama.

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It is therefore disillusionment more than anger that represents the president’s most formidable adversary. That will take battling throughout the week, in the push to fill a stadium, and fulfill a promise that isn’t so old, but has seldom felt more distant.

The president’s challenge is also his opportunity: to fill that chair with presidential leadership, and to deliver an argument for keeping himself firmly planted in that seat for another four years.