With just over 2 weeks to the next round of republican presidential primaries in the US - the battle for people's votes has hit the airwaves.<br /><br />In his latest ad republican contender, Rick Santorum has conjured up a doomsday scenario of what could happen if President Barack Obama is re-elected.<br /><br />As the presidential elections approaches, politicians are using the politics of fear in their ad campaigns.<br /><br />Al Jazeera's Rob Reynolds reports from Los Angeles.
