In the Obama era, Democrats usually have had two big advantages over Republicans: women and volunteers. This year, Republicans are trying to change that, seeking to amass an army of young female volunteers who can carry the GOP message and counter the “war on women” rhetoric that has been so effective for Democrats. Fresh off a week in which Democrats made it clear that a key part of their midterm message will be equal pay, Republicans are set to begin their own efforts to woo women to the polls, focusing on counties that went blue in 2012 and could tip...