Does the popular vote have any impact on a candidate's decision whether or not to concede?

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It has finally been proven that Gore won the popular vote in 2000 and that Kerry won the popular vote in 2004. But both conceded to Bush. Yet Democrats still appear to believe that if Obama wins the popular vote, he might not concede to McCain. What is the magic threshhold popular vote that could stop a Democratic presidential candidate from conceding to a Republican?

Authors Bio:
I'm an anti-civilizationist and election boycott advocate in San Diego. For reasons not to vote in faith-based elections with secret vote counts for candidates you cannot hold accountable if they fail to represent you, check out the discussions, articles, and videos on my website http://noinnovember.ning.com