The candidate who once depended on inspiration is now depending on arithmetic.

Even though Barack Obama lost three primaries on Tuesday and still has 12 contests to go, he probably cannot lose his lead among pledged (i.e., elected) delegates to the Democratic convention.

But that does not guarantee him the nomination.

Hillary Clinton can overturn Obama's lead by using super-delegates — the 795 party big shots who represent one out of every five votes on the conventi ...

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