When comparing the Wall Street Journal poll this past week to the actual results; WSJ measures Evangelical Christians. The small number of respondents are to be expected.
Real Clear Politics Average came fairly close to winner in the outcome in South Carolina for the Republicans.
Trump - 31.8 and SC 32.5
Rubio - 18.8 and SC 22.48
Cruz - 18.5 and SC 22.33
It is still a somewhat rough poll for second and below.