Which of these statements are true?

[minionofmidas]

None are unequivocally true.
Most 2008 Nader voters probably haven't voted for a Democrat for President since at least 1988, if ever, so the claim that Nader might have cost Democrats anything is pretty specious.
McCain would have to have pick almost every single Barr vote to win Indiana, so that statement is unequivocally untrue.
The sanest statement is the one on North Carolina, but I very much doubt even that one. Too many of those disappointed Republicans included in that tally would have just skipped the President's race, or even voted Obama.