Next up for Republicans are the Virginia , North Dakota and Washington primaries on Feb. 29.
Democrats also have a primary in Washington on the same day.
They have debated about taxes, bickered about advertisements, fought for the high ground as reformers, wrestled over the definition of conservatism, sparred over leadership, style, philosophy, and approach. But neither Senator John McCain, yesterday's victor in Michigan and Arizona, nor Governor George W. Bush, Saturday's victor in South Carolina, has discovered how to knock the other out of the struggle for the Republican presidential nomination. And so the race that the experts said was over before it began has apparently not even begun to be over. But already it is clear that the Republican race represents a fundamental change in American politics. In the old politics, the field of candidates was winnowed by voters.