Pay Attention to Iowa
People are talking about the polling numbers between between Hillary Clinton and Barack Obama. What isn't being mentioned is John Edwards is pulling away in Iowa polls. Edwards was already ahead of Tom Vilsack. With Visack gone that clears the stage for Edwards.
The first three states are the Iowa caucas and the New Hampshire and South Carolina primaries. Edwards will win South Carolina. If Edwards doesn't make any major missteps he will win Iowa. Edwards will go 2 out of 3. John Kerry was badly behind in New Hampshire in 2004. He made a last ditch play to win Iowa and he pulled New Hampshire.
The short answer is Clinton and Obama need to make sure they win New Hampshire. If either of them go 0 for 3 then it is over.