Al Jazeera's Nick Spicer reports on the next stop in the election campaign.

US Democrats Hillary Clinton and Barack Obama are just hours away from their next big contest in their bids for the party's nomination.

Indiana and North Carolina vote on Tuesday - but don not offer enough delegates to give either candidate a knockout blow.

Obama is hoping to stifle Clinton's surge in the race. He is especially concerned about Clinton's strength among the working class whites.