Democrat Mark Pryor, chairman of the Senate Appropriations subcommittee on agriculture, leads Republican challenger Tom Cotton, 51-40, in an NBC/Marist telephone poll of 1,174 registered voters in Arkansas, with 7 percent undecided and 2 percent backing someone else. Margin of error +/-2.9 percent, says Pollster. It is the largest lead Pryor has registered. Election day is six months… » Read More