SC-CBS/YouGov: D: Clinton 59% Sanders 40%; R: Trump 42% Cruz 20% Rubio 15% Kasich 9%

[Shadows]

Too big of a MOE to judge anything from this. I am sure a win in Nevada can give a substantial positive swing for Sanders.

I think the estimate of 40-60 or maybe 42/43-57/58 is a fair assessment at this point. Clinton is ahead by about 15-20% odd IMO even after the Sanders NH momentum.

The target for Sanders is to get the loss down to 10% or less & win close to 40% of the black votes.

Very worrying for Clinton in the general though, SC is majority white even with such big black population. She is in for a huge defeat overall with such poor polling among whites if she ends up getting elected

[Shadows]

"Margin of error of 9" doesn't mean "It could be [reported result-9] just as it could be [reported result+9]." It just means there's a 95% probability that the result will fall somewhere within that range.

It is Plus & minus 9. It does mean that.

What you are talking about is Confidence Interval. Most surveys are conducted with a confidence interval of 95%.