Hillary Clinton and Bernie Sanders are facing off in the South Carolina primary, the latest battleground for the Democratic presidential nomination.

Mrs Clinton is seen as the favourite to clinch the state.

But on the eve of the vote, Mr Sanders was endorsed by Robert Reich, a former official in Bill Clinton’s presidential administration.

Both contenders are hoping to build momentum ahead of “Super Tuesday” primaries in 11 states next week.

South Carolina is the Democrats’ fourth nominating contest since the primaries began on 1 February.