Since it's impossible for Obama or Clinton to win the nomination with elected ("pledged") delegates, Super Delegates will provide the margin one way or another.
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http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=132x4429219 )
There is no persuasive reason to think Obama or Clinton will have more elected delegates, or more Super Delegates. It is UNKNOWN.
So this is a good time to take the Pledged delegate Pledge.
I will consider the winner of the primary delegates to be the candidate that should win the nomination. That doesn't mean it will happen, but if my candidate loses among the elected delegates, I will not undergo a conversion and start arguing that it's obvious that Super Delegates should decide the nomination. (This doesn't mean you cannot secretly hope for your candidate to win by any means nessecary... just that you won't lecture other people about the moral and ethical nuances of the process based on which candidate various rules turn out to benefit.)