Obama jokes about birth certificate ... again

Interesting at the very end of President Obama's Oklahoma event, a woman was overheard telling the president she was born at same hospital in Hawaii.

Obama shot back: "Do you have YOUR birth certificate?"

At an Irish reception with Prime Minister Enda Kenny earlier this week, the president was given a certificate of his Irish heritage. He dropped a joke then too.

"This will have a special place of honor alongside my birth certificate," he said.