Here. 

ADDENDUM:  The YDN piece suggests that five full professors in the Yale Department did not sign; they are clearly counting all those with courtesy appointments in philosophy (some of those did sign, as it happens, but several didn't–they may not even have known of it, I do not know).  But of those whose tenure home is Philosophy, only two did not sign:  Gendler (for legitimate reasons noted originally) and Karsten Harries (for reasons unknown).