I think that was rather predictable. The hard left of the Democratic party hate the president, think he is a traitor and practically a third-term Bush '43, and they want to get somebody like Kucinich or Sanders himself to primary Obama. This is not that last time we'll see a call for a Dem primary challenger this year, and who knows? Someone might step up just to make the liberal case.
Come on dude, chill out. The left wing of the Dems might be dissapointed or displeased but they certainly don't "hate" Obama. Not even David Broder's ghost would say something so ridiculous.
And in case you haven't noticed, Kucinich isn't exactly Mr. Popularity among the Kos crowd.