Is there a movement to make psilocybin mushrooms legal again?

Yes, though small: "Movement" may be too strong a word but a growing number of researchers, practitioners & patients believe psylocybin, LSD, MDMA & other psychedelics should be legalized for prescription use given the large body of research on the powerful therapeutic benefits achievable by proper use of these medicines. One organization at the forefront of this movement is MAPS: http://www.maps.org/about/mission