Barack Obama is leading Hillary Clinton 54 percent to 38 percent in Mississippi which holds its primary Tuesday, according to an American Research Group poll. The survey was conducted and has a 4 point margin of error. That represents an 8 point pickup for Clinton compared to ARG’s March 5-6 poll. Clinton leads 65 percent to 28 percent among white voters (43 percent of the sample) while Obama leads 75 percent to 15 percent among black voters (54 per cent of the sample). Compare to earlier polls by ARG and Rasmussen Reports.