The breakdown in Missouri is 33% McCain, 32% Huckabee, 29% Romney. To me, that sums up the split we face in the party now: with Moderate and Veterans going mostly to McCain, Evangelicals and Populists going mostly to Huckabee, and Fiscal Conservatives and Establishment Pro-Bush Republicans going mostly to Romney.
The exit polls are here: Fewer than 10,000 votes separate McCain from Huckabee, and fewer than 22,000 separate McCain from Romney. Huck gets the younger people, McCain the older; McCain gets the pro-choicers, Mitt gets the "sometimes legal," Huck the pro-life; the less you go to church, the more likely you are to vote for Romney; immigration hardliners went mostly to Romney, while path to citizenship folks went to McCain.
The only really jarring thing about it: the 30% of GOP primary voters who opposed the war in Iraq went overwhelmingly for McCain.
But overall, a bellwether result from the state, and in my opinion, very representative of the divide in the party right now.