The "Christian" left is ignored, because it doesn't exist, it isn't possible.
The "Christian Left" is an invention, nothing more than cover for an attempt to co-opt religion and its language to push the same old tired mantra of socialism, Marxism and anarchy that the hard left has tried to foist on us for decades. It doesn't take much digging to find that the Christian left's "beliefs" are the same as the lefts - radical feminism, environmentalism, multiculturalism, etc.