Eyeing to become the first woman president of the US, the 68-year-old former Secretary of State has an impressive 27 points lead over Sanders, 74, from Vermont.
At the national level, her lead over Sanders is now less than six per cent. Clinton leads in the delegate count after winning two of the first three states to vote - in Iowa, narrowly, and then in Nevada.
In South Carolina, where 55 per cent of voters in the 2008 Democratic primary were African-American, polls show Clinton is favoured to win - that could wipe away the memories of her 2008 primary loss in the state.
She is campaigning for a landslide victory in South Carolina's Democratic primary, while Sanders is already looking ahead to Minnesota, Colorado, Illinois and beyond.
Clinton and her husband Bill Clinton, the former US President, along with their daughter Chelsie have spent the last few days in South Carolina, where she is highly popular.
"The South Carolina primary is personally important to me because I want to send a strong signal that South Carolina is ready for change, ready for progress, ready to make a difference," Clinton said yesterday during a rally in Columbia.


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