It is sometimes suggested that the main reason for this disparity is most programs are broadcast at times when women are the major part of the audience. (religion-online.org)
One reason for the disparity between the parties, political insiders say, is that the top Republican candidates are not exciting voters the way the Democratic front - runners are. (epolitics.com)
The primary reason for this disparity is simple: turnout. (totalpolitics.com)