Because he was reading the Irish PM’s speech on the teleprompter, not his own:

But Cowen was 20 seconds into his second address when it dawned on him that he was giving word for word the speech that Obama had just read from the same teleprompter.
Cowen stopped and looked back at the president to say, “That’s your speech.”
Obama laughed and returned to the podium to offer what might have been Cowen’s remarks. In doing so, President Obama thanked President Obama for inviting everyone over.

Um…I thought we were supposed to be getting a more articulate president than the last one. I don’t remember Bush ever thanking himself. So, you guys who crowed over the Bushisms, are you going to ridicule Obama for his teleprompter dependency?

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