Why Bernie Sanders Isn't Dropping Out

Bernie Sanders isn't going anywhere, despite Hillary Clinton's prohibitive delegate lead, and Tuesday night offers a hint why. But the underdog's path forward carries risks as well as challenges.

Even though Sanders came up short in Arizona, where his campaign invested most heavily, the Vermont senator ended up netting 17 delegates over Clinton Tuesday, thanks to lopsided wins in the Idaho and Utah caucuses.

He ended up taking away a tidy 57 percent of the pledged delegates up for grabs that day. And as it happens, 58 is the percentage of outstanding pledged delegates Sanders needs to win from now on in order...

Read the rest of the story at NBC News.

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