Can yeast leaven cornmeal?
Most bread recipes that have cornmeal usually use a combination of cornmeal and wheat flour.  I have made pizza crusts with cornmeal leavened with yeast, but they are about 1/3 to 1/2 cornmeal.  Any more than that and they have a texture more like polenta or grits than bread.  Short answer, yes, if you mix the cornmeal with wheat flour.