SurveyUSA’s South Carolina polling released earlier this week showed movement not only in the Republican Presidential Preference Primary , but also in the Democratic contest, where Barack Obama has closed the gap and is now within striking distance of Hillary Clinton.

Compared to an identical SurveyUSA tracking poll released a month ago, Clinton is down 3, from 47% then to 44% now. Obama is up 7, from 33% then to 40% now. Clinton had led by 14, now leads by 4, within the survey’s margin of sampling error.

Obama ran stronger in each of the 3 days of the interviewing period, and led Clinton, nominally, in those interviews completed after Winfrey’s Sunday 12/09/07 football stadium rally with Obama. This research conducted exclusively for WCSC-TV Charleston and WSPA-TV Greenville. Full results are here .