Noted: Clinton will win more pledged delegates in primary states. Obama's edge comes from caucus states. It's true that some of the caucus states might have been inclined to give Obama the edge even if the more participatory process was used.
For the record: I opposed caucuses in Arkansas way back when the discussion began about moving up our primary, long before Obama became a candidate. Switching to a caucus system was briefly mentioned by some politicians here. I don't like caucuses They are too easily manipulated by small numbers of people.
Here, by the way, are some polling results favorable to Clinton on the electability question. It is presented somewhat grudgingly by the reliably pro-Obama Talking Points Memo.