ANALYSIS: Hillary Clinton Takes Control of Democratic Race for President

Clinton leaves South Carolina with a growing delegate lead.

“Tomorrow, this campaign goes national,” Clinton said tonight in her victory speech.

The first four contests give Clinton three wins and one lopsided loss. They also answer some of the broadest questions about her ability to turn out Barack Obama’s old base – answers that are starting to break in Clinton’s favor.

African-American voters constituted a larger share of the electorate in South Carolina this year than they did in 2008, despite the obvious historic nature of Obama’s candidacy. Clinton carried black voters by more than 70 percentage points on Saturday, a week after winning African-Americans in Nevada by north of 50 points.