I thought I'd check how the delegate count would be if the Democrats had a winner-takes-all rule in this. Surprisingly little difference, but it would give Obama a bigger lead.

The current count for elected delegates (BBC site) is 1596 for Obama and 1484 for Clinton - Obama leading by 112 delegates.

With winner-takes-all it'd be Obama with 1564 and Clinton with 1360 - Obama leading by 204.

And if the superdelegates all went with their states, from the ones which have so far voted, Obama would have 306, and Clinton would have 287.