CNN: Obama 52% Romney 46%, but...

A new CNN poll of likely voters confirms a Barack Obama convention bounce, as he now leads Mitt Romney, 52%-46%.

But here's a very curious internal.

Romney leads among independents, 54%-40%. That's a blowout number. Both candidates get 96%-97% of their respective parties, so this means that this sample must have leaned Democratic big-time.

And of course, CNN didn't release the sampling breakdown.

There's no doubt Obama got a convention bounce, but the independent number indicates a pretty severe oversample among Democrats in this poll.