Everyone wants you to shut up , Joe

REALLY cool of Obama not to back his VP. Shows what loyalty is to ol' Barky.

By request, so as to not show favoritism, an abuse of position giving a candidate an unfair advantage above any other any other candidate can get?

Imagine if Obama DID endorse Biden, the cries of "corruption" and "cronyism" and whatever other crap everyone who hurled crap at Obama for a decade forgot they hurled at him even as they still hurl said crap at him today.

Sheesh, aren't there still always at least 2 memes whining some nonsense about Obama on the front page everyday?

I thought it was standard for ex presidents to support their vp's when they run?

HAA! Tell that to King Ron when he waited to endorse - despite many wondering aloud why not - Bush till AFTER he won the nomination. Petty & vindictive to the end, that pussbag.

Biden ASKED Obama not to endorse him, and despite what the 'informed' chorus on this site says, he has been routinely chided by the press and mocked by comedians for his more than occasional "Obama & Me"isms.

No such endorsements come to mind, though I could be wrong on that.