I think there's an obvious confluence of interests between the Edwards and Obama campaigns in many ways, but this seems pretty odd:

How good was Barack Obama's speech at the Iowa Democratic Party Jefferson Jackson dinner Saturday night? Long after the event ended, as a scrum of giddy Obama staffers were all-but-forcibly exited from the bar of the Fort Des Moines Hotel, they struck up a spontaneous chorus of the campaign's newly debuted catchphrase: "Fired up!" Beat. "Ready to go!" Beat "Fired up!" Beat. "Ready to go!" This slightly manic release of tension and elation wasn't surprising. What was surprising was the person leading it: John Edwards campaign manager Joe Trippi, who punctuated each explosive slogan with a pumped fist.

Of course, while it would be inconceivable to me for Trippi to be hired by Hillary Clinton's campaign, one could imagine Barack Obama capturing the nomination and hiring Trippi for something or other so maybe Trippi has perfectly good reasons for playing footsie like this. More speculation from Noam Scheiber if you're interested.