Momentum shifted in Clinton's favor, and she won the popular vote in the Nevada caucuses eleven days later, despite Obama's endorsement from the influential Culinary Workers Union. However, Obama ran strongly in rural areas throughout the state, and he beat Clinton in the delegate count. Edwards' support collapsed in Nevada, as voters coalesced around the two apparent frontrunners. Dennis Kucinich withdrew from the race. In the following week, issues regarding race came to the fore as campaigning began for the South Carolina primary, the first to feature a large proportion of African Americans in the Democratic electorate. Behind in the state polls, Clinton left to campaign in some Super Tuesday states, while her husband, former president Bill Clinton, stayed in South Carolina and engaged in a series of exchanges with Obama. CBS News reported, "By injecting himself into the Democratic primary campaign with a series of inflammatory and negative statements, Bill Clinton may have helped his wife's presidential hopes in the long term but at the cost of his reputation with a group of voters Americans that have long been one of his strongest bases of political support."