United States Democratic presidential candidate Bernie Sanders is increasingly being viewed as a threat to front-runner Hillary Clinton.

The self-described socialist is calling for free higher education and more government-funded jobs.

Supporters of the Vermont senator see him as more of a populist leader than Clinton, who they view as a candidate backed by wealthy corporations.

Watch Al Jazeera correspondent Tom Ackerman's report from the campaign trail with Sanders in South Carolina.

Source: Al Jazeera