Loss is major setback for Huckabee. Romney remains contender with win in Nevada.
He builds his campaign in the state on lessons from his run in 2000.
Romney's Michigan win deepened GOP uncertainty before crucial upcoming contests.
Now, the Republican presidential nomination battle shifts from the typical tack of achieving inevitability to one where candidates work to amass the most delegates.
The state's economic woes are the central focus for Romney, McCain, and Huckabee before Tuesday's primary.
On the Democratic side, a potentially historic clash lies ahead. For the GOP, Michigan is the next test.
Results in the Granite State mean frontrunners in both parties will continue to duke it out for the nomination.
The Democratic contest is more likely to be decisive.
Caucus results shake up the race for the White House in both parties.