The polls are shifting and the Iowa caucus is just weeks away. BuzzFeed News reporters Evan McMorris-Santoro and Ruby Cramer are reporting from Charleston, South Carolina.

Bernie Sanders and Hillary Clinton during a Democratic presidential primary debate last month in New Hampshire.

Jim Cole / AP

This post will be updated once the debate begins.

The debate is being held roughly two weeks before the Iowa caucus on Feb. 1.
The New Hampshire primary will then be held on Feb. 9.
Recent polls indicate a shift in the once-wide lead Clinton held over Sanders.
A poll of New Hampshire voters by Monmouth University indicated that 53% of voters would choose Sanders, compared to 39% for Clinton.
Another poll of Iowa voters conducted by the Des Moines Register and Bloomberg Politics shows that Clinton still has a 2% edge over Sanders. Last month, however, she had a 9% lead.
On Friday, the chairman of the RNC said Sanders would probably be a more difficult candidate to face than Clinton.