Shortly after Biden withdrew from the presidential race, Obama privately told him he was interested in finding an important place for Biden in his administration. Biden declined Obama's first request to vet him for the vice-presidential slot, fearing the vice presidency would represent a loss in status and voice from his Senate position, but he later changed his mind. In early August, Obama and Biden met in secret to discuss the possibility, and developed a strong personal rapport. On August 22, 2008, Obama announced that Biden would be his running mate. "The New York Times" reported that the strategy behind the choice reflected a desire to fill out the ticket with someone with foreign policy and national security experience—and not to help the ticket win a swing state or to emphasize Obama's "change" message. Others pointed out Biden's appeal to middle-class and blue-collar voters, as well as his willingness to aggressively challenge Republican nominee John McCain in a way that Obama seemed uncomfortable doing at times. In accepting Obama's offer, Biden ruled out running for president again in 2016, but his comments in later years seemed to back off that stance, as he did not want to diminish his political power by appearing uninterested in advancement. Biden was officially nominated for vice president on August 27 by voice vote at the 2008 Democratic National Convention in Denver.