He's being just as gracious as the Clinton campaign was at this point in 2008.
Even if the two were in any way comparable (they're not), the key difference is that Hillary was solely fighting her opponent, Obama, while Bernie is fighting basically everyone who doesn't kiss his ass, actively working to block unity and trying to destroy the party's chances in November.
He really isn't. All he wants to do is make the process more open. Clinton did more damage to Obama and party unity with her pseudo-racist campaign in 2008 than Sanders has even come close to this year.
How exactly was her campaign racist in 2008?
She ran against a black guy. She shouldn't have done that.
Sanders's horrible handling of addressing the Nevada convention debacle was a signal that he isn't going to be gracious in defeat. His rhetoric hasn't been toned down and if anything he is just fanning the flames of his already irate and unhinged supporters who despise Hillary more than Satan.
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