Actually I'm wrong, no state considers it to be rape if neither party is coherent.
Convictions have been made based on individual cases, thought for the most part the Woman in these cases are brushed off as someone who deserved what happened.
I remember a specific case in which a girl was raped by 3 men, they (all 4 of them) were extremely intoxicated and filmed the encounter. On the film you can hear the woman saying no over and over but the men continued. Despite the evidence on the film the men were not convicted because 'She was obviously drunk and flirtatious before the sexual encounter began'.