President Joe Biden’s introduction to the White House was a hard sell, according to a new interview. Biden admitted he had to be convinced to join former President Barack Obama on his 2008 presidential ticket, speaking on the Wednesday episode of the popular podcast run by late night host Conan O’Brien. During an interview on “Conan O’Brien Needs a Friend,” the 81-year old Democrat disclosed that he was ultimately convinced to join the ticket by his own mother, Catherine Finnegan. Biden claimed he had initially declined an offer to be vice president from Obama. “Barack, I don’t wanna be vice p…