When social movements achieve some success in meeting goals, elite opponents may see compromise and collaboration with movement organizations as a desirable option. The consequences for advocacy organizations of elite concessions are contested. Some highlight the political opportunities created by elite support, such as increased access to financial resources, political processes, and new audiences. Others identify potential liabilities, including demobilization, bureaucratization, and the co-optation of advocacy frames. Herein is presented a framework for analyzing the pathways through which realignments among elite opponents influence social movement struggles, using the first fifteen years of the international climate negotiations as a historical case. After years of pressure from environmental advocacy organizations, some global oil corporations shifted their climate policy stance from obstruction to collaboration. These realignments in turn affected the activities, framing strategies, policy access, and cross-group relations of climate advocacy groups, benefiting some to the detriment of others.