This is the nightmare scenario that wakes me up at night. And its so easy to see it develop.Hillary wins big in Penn and PR, while Obama continues to sweep up some smaller states. Neither is close to the majority number, but Hillary refuses to give in.More and more polling begins to suggest — as Pew does today — that Obama will lose a significant number of blue collar “Archie Bunker” democrats that are currently supporting Hillary, but will vote for McCain before Obama. This will give McCain states like Ohio, Michigan, and Penn. Superdelegate/party leaders will know that they cannot...