If you can then you should recognise that delegate math, polls and projections, examination of current campaign strategy are the basis for thinking his candidacy is likely not going to be viable for much longer.
She is currently projected to win SC by significant margin.
She is projected to win most of the Super Tuesday states, several of these by significant margin. A recent spate of positive polls just came out, ergo it's talked about.
The campaign's
current advertising strategy is based around winning his home state, and four other Super Tuesday states. The largest of these is worth 91 delegates, the sum of these is worth 288. Texas is worth 222 delegates.
The projected delegate lead from these wins would give her a significant pledged delegate lead, the proportional system essentially makes it impossible to come back from behind, as Clinton herself learned in 2008.
She is also currently polling better in most, if not all, post-Super Tuesday states.
Can things change? Sure. A week is a long time in politics. But there's nothing wrong with taking the information we have now and talking about the plausible outcome: that if the above holds she will likely have secured the Democratic nomination by next Tuesday.