Depending on who the legislature chooses, that person could face a primary challenge from the left. (governing.com)
One result of this posture is that social democracy is beginning to face significant challenges from the left. (blog.politics.ox.ac.uk)
Come 2016, the primary challenges from the left will once again come and it's unlikely they will be ended by any promises of a deal. (nystateofpolitics.com)