Story highlights Obama's quip to the African Union in Addis Ababa, Ethiopia, came as he critiqued some African leaders' reluctance to turn over power.

The President spoke extensively on the corruption within Ethiopia and other African nations, warning it was holding these societies back.

Washington (CNN) President Barack Obama said Tuesday that he could win a third term in office if he ran again but that he is barred by the Constitution.

"I actually think I'm a pretty good President. I think if I ran, I could win. But I can't," Obama ad-libbed during a speech in Ethiopia. "There's a lot that I'd like to do to keep America moving. But the law is the law, and no person is above the law, not even the president."

Obama's remarks, which come on the same day that a new CNN/ORC poll found his approval rating standing in net-positive territory for the second month in a row, were made to the African Union in Addis Ababa. He is the first U.S. president to address the group, and was critiquing some African leaders' reluctance to turn over power.

"Africa's democratic progress is also at risk when leaders refuse to step aside when their terms end. Now let me be honest with you -- I do not understand this," Obama said, going on to say that he is looking forward to life after the presidency.

The loudest applause line of his address came when Obama said he didn't understand the motivation behind remaining in power through force -- even when leaders have "got a lot of money."

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