Biden could never have won 53% of the Democrat vote except for the fact that Obama picked him as running mate in the interest of "change."
Biden should not be considered at all in any Electoral College vote that has disallowed Obama as a candidate.
Of course we are all dreaming here anyhow.
Some of us are trying to determine exactly how the Constitution would handle such an issue. And it is clear that Obama’s disqualification would not affect Biden. It matters not how he was nominated only that he was legitimately on the state ballots.