Biden confuses Jill's father with her grandfather in Delaware speech 

It is one of President 's favorite lines, allowing him to riff on his Irish heritage and his love for .

'I may be Irish but I'm not stupid,' he told an audience in New Castle, on Friday, before delivering the punchline: 'I married Dominic Giacoppa's daughter.'

The line got a laugh — as it did on St Patrick's Day at the .

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