This 29 February 2020 video about the USA says about itself:
Earlier tonight, Joe Biden was projected to be the big winner of the South Carolina primary, with Bernie Sanders in a clear but distant second place. No one else appears to be viable for delegates. Many in the media in sources like MSNBC and CNN are suggesting that this is a sign of change in the campaign, but the fundamental reality is that Bernie Sanders remains the national frontrunner for the 2020 Democratic nomination and the favourite for a strong Super Tuesday result.
Biden had concentrated all his fossil fuel corporate donated money and campaigning on relatively small South Carolina; after he had lost the three previous primary elections; and a fourth defeat would have been the end of his campaign. It worked for him; there. But how will that work in big states like Texas and California this Tuesday, the Super Tuesday in primary elections?
This 29 February 2020 video from the USA is called SHOCK: Biden Hasn’t Campaigned In ANY Super Tuesday States.