"God rest her soul," Biden said Wednesday night as he introduced Cowen and President Obama.
CBS Radio News White House correspondent Mark Knoller reports that the Vice-President quickly caught himself.
"Although, wait, your mom's still alive. It's your dad who passed," said Biden, adding, "God bless her soul."
"I got to get this straight," quipped Biden as the audience chuckled at his blunder.
Biden then cited the Irish proverb that "a silent mouth is sweet to hear" and yielded the podium to the president.