Sen. Kay Hagan, a Democrat, is trying to stave off GOP challengers in North Carolina, where enrollment in Obamacare exceeded Avalere's projection by more than 50 percent. (Associated Press Photographs)

Photo by: Lynne Sladky

Sen. Kay Hagan, a Democrat, is trying to stave off GOP challengers in North Carolina, where enrollment in Obamacare exceeded Avalere's projection by more than 50 percent. (Associated Press Photographs)